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A1 verb /biː/

be

である
Meaning
To exist, to occur, or to have a particular quality.
Example
She wants to be a doctor.
彼女は医者になりたい。
A1 noun /ˈbɜːrθ.deɪ/

birthday

Meaning
the anniversary of the day on which a person was born, typically celebrated annually
Example
We are planning a surprise birthday party for her.
C2 noun /ˌbræɡəˈdoʊʃioʊ/

braggadocio

自慢話
Meaning
boastful or arrogant behavior; empty boasting
Example
His endless braggadocio annoyed everyone at the party.
彼の終わりのない自慢話はパーティーの皆をイライラさせた。
C2 verb /bɪˈfʌdəl/

befuddle

混乱させる
Meaning
to confuse someone completely; to make someone unable to think clearly
Example
The complex instructions befuddled the students.
複雑な指示が学生たちを混乱させました。
B2 noun /ˈbɜːrdn/

burden

負担
Meaning
a heavy load, especially one that is difficult to carry
Example
The financial burden was too heavy for him to bear.
財政的な負担は彼にとって非常に重かった。
C2 noun /ˌbuː.ɡənˈvɪl.i.ə/

Bougainvillea

ブーゲンビリア
Meaning
a tropical climbing plant with colorful bracts surrounding small flowers
Example
The bougainvillea climbing over the garden wall creates a beautiful purple display.
庭の壁を登るブーゲンビリアが美しい紫色の展示を作り出します。
C2 noun, verb /ˈbɛvəl/

bevel

斜面
Meaning
A sloping edge or surface; to cut or shape an edge at an angle.
Example
The carpenter beveled the edges of the table.
大工はテーブルの端を斜めに切りました。
C2 noun /ˈbroʊmaɪd/

bromide

ありきたりなアイデア
Meaning
A trite or unoriginal idea or remark; also a chemical compound of bromine.
Example
His speech was full of old bromides about hard work.
彼のスピーチは、努力についての古いありきたりなアイデアでいっぱいだった。
A2 noun /belt/

Belt

ベルト
Meaning
a strip of leather or cloth worn around the waist to support clothes or for decoration
Example
He tightened his belt before going for a run.
彼は走りに行く前にベルトを締めました。
B1 verb /bliːd/

bleed

出血する
Meaning
to lose blood from the body, especially due to injury
Example
She began to bleed from the cut on her arm.
彼女は腕の切り傷から血を流し始めた。
B1 adverb /bɪˈniːθ/

Beneath

下; 下方
Meaning
under; below; underneath
Example
The treasure lies beneath the old tree.
宝物は古い木の下にあります。
C1 noun /bʊk ˈbaɪn.dər/

Book binder

本の製本工
Meaning
a person whose job is to fasten the pages of books together and put covers on them
Example
The old book binder carefully restored the antique manuscript.
古い本の製本工は古文書を慎重に修復しました。
C2 noun /ˌbaɪ.oʊ.rɪˌmiː.diˈeɪ.ʃən/

bioremediation

バイオレメディエーション
Meaning
The use of living organisms to neutralize or remove environmental contaminants.
Example
Bioremediation helps remove toxins from polluted soil.
バイオレメディエーションは汚染された土壌から毒素を取り除くのに役立ちます。
C1 adjective /ˈbær.ən/

Barren

不毛の; 荒涼とした; 生産性がない; 不生産的
Meaning
sterile; unable to produce; desolate; unproductive
Example
The barren desert stretched for miles without any vegetation.
荒れ果てた砂漠は何マイルも広がり、植物は一切なかった。
B2 noun /braʊ/

brow

額
Meaning
the part of the face above the eyes; forehead
Example
She wiped the sweat from her brow.
彼女は額の汗を拭った。
C1 verb /bruːd/

brood

Meaning
to think deeply about something that makes one unhappy; also, a group of young birds hatched at the same time
Example
He sat alone, brooding over his failures.
C2 noun /ˌbenɪˈdɪkʃən/

Benediction

祝福
Meaning
a blessing, especially a ceremonial one; an expression of good wishes
Example
The priest gave his benediction to the newlyweds.
神父は新婚夫婦に祝福を与えました。
A2 noun /ˈbɪz.nəs/

Business

ビジネス; 事業; 商業
Meaning
work relating to the production, buying, and selling of goods or services
Example
He started his own business after graduating from university.
彼は大学を卒業後、自分のビジネスを始めました。
C2 noun /ˈbɑːr.kəˌroʊl/

barcarole

バルカロール
Meaning
a traditional Venetian boat song, often in 6/8 time
Example
The orchestra played a beautiful barcarole that reminded me of Venice.
オーケストラは美しいバルカロールを演奏し、私にヴェネツィアを思い出させました。
B1 verb/noun /bɔːr/

bore

退屈させる
Meaning
Verb: To make someone feel uninterested or tired; Noun: A dull or tiresome person.
Example
The lecture began to bore the students.
講義は学生を退屈させ始めた。
B2 noun /ˈbænər/

banner

Meaning
a large printed sign used for advertisements or announcements
Example
The company displayed a banner to advertise their new product.
B2 adjective /bɪˈkʌmɪŋ/

becoming

似合う
Meaning
attractive, suitable, or flattering to the wearer or situation
Example
That dress is very becoming on her.
そのドレスは彼女にとても似合っています。
C1 verb /blɛər/

blare

大きな音を立てる
Meaning
to make a loud, harsh sound
Example
The car horns blared all night.
車のクラクションは一晩中鳴り響いていた。
C2 verb /bɪˈweɪl/

bewail

嘆き悲しむ
Meaning
to express deep sorrow or regret over something; to mourn openly
Example
She bewailed the loss of her childhood home.
彼女は子どもの頃の家を失ったことを嘆き悲しんだ。
B1 noun /bæŋ/

Bang

突然の大きな音; 強い衝撃や打撃
Meaning
a sudden loud noise; a hard blow or hit
Example
The door closed with a loud bang that woke everyone up.
ドアが大きな音を立てて閉まり、皆を起こしました。
C1 noun /ˈbrɛvɪti/

brevity

Meaning
Concise and exact use of words in writing or speech.
Example
The brevity of the speech kept the audience engaged.
B2 adverb /ˈbəʊld.li/

Boldly

大胆に; 恐れずに
Meaning
in a confident and brave way; without fear
Example
She boldly stepped forward to face the challenge.
彼女は挑戦に立ち向かうために大胆に前進した。
C1 noun /ˈbjuːɡəl/

Bugle

バグル
Meaning
a brass musical instrument similar to a trumpet but without valves, used especially for military calls
Example
The soldier played the bugle to signal the start of the ceremony.
兵士は式典の開始を合図するためにバグルを吹いた
C1 noun /beɪl/

bail

保釈
Meaning
the temporary release of an accused person awaiting trial, often with a financial guarantee
Example
He was granted bail after his arrest.
逮捕後、彼は保釈されました。
B1 noun /bɪˈheɪvjər/

behavior

行動
Meaning
The way in which one acts or conducts oneself, especially toward others.
Example
The teacher praised her good behavior in class.
先生はクラスで彼女の良い行動を称賛しました。
C2 noun /ˈbrɪmˌstoʊn/

brimstone

Meaning
Sulfur, especially when considered as fiery and associated with hell or divine punishment.
Example
The preacher spoke of fire and brimstone to warn the congregation.
C2 verb /blæsˈfiːm/

blaspheme

冒涜する
Meaning
to speak irreverently about God or sacred things
Example
He was accused of blaspheming during the heated argument.
彼は激しい議論中に冒涜したとして告発されました。
C1 verb /bɒmˈbɑːrd/

bombard

Meaning
to attack continuously with bombs, questions, or other forces
Example
Reporters bombarded the minister with difficult questions.
C2 verb /bɪˈdɛk/

bedeck

飾る
Meaning
to decorate or adorn something in a showy way
Example
The hall was bedecked with flowers for the wedding.
ホールは結婚式のために花で飾られました。
A1 verb /brɪŋ/

bring

持ってくる
Meaning
to carry or take something to a place; to come with something
Example
Please bring your books to class tomorrow.
明日、クラスに本を持ってきてください。
A1 adjective /bæd/

bad

悪い
Meaning
not good; unpleasant, harmful, or of poor quality
Example
The milk smells bad, so don’t drink it.
牛乳は悪臭がするので飲まないでください。
C2 verb /beɪt/

bate

減らす、抑える
Meaning
to lessen or restrain; to diminish the force or intensity of something
Example
He spoke with bated breath as he waited for the result.
彼は結果を待ちながら息を呑んで話した。
A1 noun /ˈbɛdruːm/

bedroom

寝室
Meaning
A room used for sleeping in.
Example
The children were playing in the bedroom.
子供たちは寝室で遊んでいました。
C1 noun /ˈbraɪ.dəl/

Bridle

手綱; 騎馬用具
Meaning
the headgear used to control a horse, consisting of buckled straps and a bit
Example
The rider adjusted the horse's bridle before mounting for the race.
騎手はレースの前に馬の手綱を調整した。
B2 noun /ˈbæk.boʊn/

Backbone

背骨
Meaning
the series of vertebrae extending from the skull to the pelvis; spine
Example
He injured his backbone in the accident.
彼は事故で背骨を怪我した。
B1 noun /bɪˈhɑːf/

behalf

を代表して
Meaning
as a representative of someone; in the interest of someone
Example
She accepted the award on behalf of her team.
彼女はチームを代表して賞を受け取りました。
B1 adjective /bɔɪld/

Boiled

ゆでた
Meaning
cooked in boiling water
Example
She served boiled eggs for breakfast.
彼女は朝食に茹で卵を出しました。
C1 noun /ˈbenɪˌfæktər/

Benefactor

恩人; 支援者; 寄付者
Meaning
a person who gives money or other help to support a person or cause; a patron
Example
The anonymous benefactor donated millions to the hospital.
匿名の寄付者は病院に何百万も寄付しました。
B2 noun /ˈbev.ər.ɪdʒ/

Beverage

飲み物
Meaning
a drink, especially one other than water
Example
Would you like a hot or cold beverage with your meal?
食事に温かい飲み物または冷たい飲み物をお望みですか？
C1 noun /bəˈrɑːʒ/

barrage

集中攻撃または速攻
Meaning
a concentrated outpouring of questions, criticisms, or blows; a rapid, continuous attack
Example
The politician faced a barrage of tough questions from reporters.
政治家は記者からの厳しい質問の集中攻撃に直面していました。
C2 noun /bɪˈtroʊðəl/

betrothal

婚約
Meaning
The formal engagement to be married.
Example
Their betrothal was announced to the whole village.
彼らの婚約は村中に発表されました。
C1 verb /bɪˈwɪldər/

bewilder

困惑させる
Meaning
to cause someone to be confused or puzzled
Example
The complex instructions bewildered the students.
複雑な指示は学生を困惑させました。
B2 adjective /bɪˈliːvəbl̩/

believable

信じられる
Meaning
Able to be trusted or accepted as true or reasonable.
Example
Her story was so detailed that it sounded believable.
彼女の話は非常に詳細で、信じられるように聞こえました。
B1 noun /blaʊz/

Blouse

ブラウス
Meaning
a woman's loose upper garment resembling a shirt
Example
She wore a beautiful silk blouse to the party.
彼女はパーティーに美しいシルクのブラウスを着て行った。
C2 noun /ˈbɔːbəl/

bauble

小さな装飾品
Meaning
A small, decorative trinket or ornament, often of little value.
Example
She wore a shiny bauble around her neck.
彼女は首に輝く小さな装飾品をつけていた。
C2 noun /boʊ/

beau

ボーイフレンド
Meaning
a male admirer or boyfriend; a fashionable young man
Example
She arrived at the party with her beau.
彼女は彼氏と一緒にパーティーに来ました。
C2 verb /bɪˈtaɪd/

betide

起こる
Meaning
to happen or occur, usually of something that befalls someone
Example
Woe betide anyone who breaks the rules.
ルールを破る者は災難を被るだろう。
C2 noun /ˈbed.ləm/

Bedlam

混乱; 騒がしい混乱
Meaning
a scene of noisy confusion; chaos and disorder
Example
The classroom was complete bedlam after the fire alarm.
火災警報後、教室は完全に混乱していました。
C2 adjective /ˈbɒni/

Bonny

美しい; かわいい; 楽しい
Meaning
cheerful; pretty; attractive
Example
The bonny child played happily in the garden.
美しい子供は庭で幸せに遊んでいました。
B2 adverb /bɪˈfɔːr.hænd/

Beforehand

前もって; 事前に; あらかじめ
Meaning
in advance; ahead of time; earlier
Example
We prepared everything beforehand.
私たちは前もってすべて準備しました。
B1 verb /bʌmp/

bump

衝突
Meaning
To hit something or someone by accident; to knock against something.
Example
He accidentally bumped into the door.
彼はドアに偶然ぶつかった。
B2 noun /biːd/

Bead

ビーズ
Meaning
a small round object with a hole through it for threading
Example
She made a necklace with colorful beads.
彼女はカラフルなビーズでネックレスを作った。
B2 noun /ˈbʌf.ə.loʊ/

Buffalo

バッファロー
Meaning
a large wild ox with heavy horns; American bison
Example
The buffalo grazed peacefully in the meadow.
バッファローは草原で平和に草を食べていた。
C2 adjective /ˈbɛərˌfeɪst/

barefaced

厚かましい
Meaning
shameless and undisguised; openly bold or unashamed
Example
He told a barefaced lie in front of everyone.
彼はみんなの前で厚かましい嘘をついた。
A2 adverb /bɪˈjɒnd/

Beyond

超えて; 定められた範囲を越える;
Meaning
further away than; exceeding; more than
Example
The mountains stretched beyond the horizon.
山々は地平線を越えて広がっていた。
C1 verb /bæsk/

bask

日向ぼっこ
Meaning
to lie in warmth and light; to enjoy something pleasurable
Example
The cat basks in the sunny window.
猫は日差しの差す窓辺で日向ぼっこをしている。
C1 verb /ˈbæfəl/

baffle

困惑させる
Meaning
to confuse; to be too difficult to understand
Example
The math problem baffles me completely.
数学の問題は私を完全に困惑させます。
C2 adjective /ˈbɪbjələs/

bibulous

酒好き
Meaning
Excessively fond of drinking alcohol.
Example
His bibulous habits worried his family.
彼の酒好きな習慣は家族を心配させた。
A2 verb /bɛr/

bear

耐える
Meaning
to carry; to endure; to give birth to; to support
Example
She cannot bear the pain anymore.
彼女はもうこの痛みを耐えられません。
B2 verb baɪnd

bind

結びつける
Meaning
To tie, fasten, or hold together securely.
Example
This force binds quarks together.
この力はクォークを結びつけます。
C2 noun /ˌbrɪɡ.əˈdɪər/

brigadier

ブリガディア
Meaning
A military officer rank, usually commanding a brigade.
Example
The brigadier inspected the troops before the parade.
ブリガディアはパレードの前に部隊を視察しました。
A1 noun /bɒks/

Box

箱
Meaning
a container with flat sides and a lid, used for storing or carrying things
Example
She put her toys in the wooden box.
彼女はおもちゃを木の箱に入れました。
B1 noun /bʌɡ/

Bug

虫
Meaning
a small insect; a defect in a computer program
Example
I found a bug crawling on my bed sheets.
ベッドシーツで虫が這っているのを見つけました。
B1 noun /ˈbluː.ber.i/

Blueberry

ブルーベリー
Meaning
a small round blue fruit that grows on bushes
Example
She picked fresh blueberries for the pie.
彼女はパイのために新鮮なブルーベリーを摘んだ。
C2 verb /bɪˈleɪbə/

belabour

くどく説明する
Meaning
to explain something repeatedly or with excessive detail; to criticize or attack verbally at length
Example
The teacher did not belabour the point once the students understood it.
学生が理解した後、教師はその点をくどく説明しなかった。
C2 noun brəˈvɑː.dəʊ

bravado

実際ではない勇気や自信の誇示
Meaning
Show of courage or confidence that is not real.
Example
His bravado masked his nervousness before the performance.
彼のブラヴァードはパフォーマンス前の緊張を隠していた。
A2 verb /bɛɡ/

beg

お願いする
Meaning
to ask for something earnestly; to request humbly
Example
The child begged for a new toy.
その子供は新しいおもちゃをお願いしました。
A2 noun /ˈbʌtərflaɪ/

butterfly

蝶々
Meaning
an insect with large, often brightly colored wings that flies during the day
Example
A beautiful butterfly landed on the flower.
美しい蝶々が花の上に止まった。
C2 noun /ˈbɒmbæst/

bombast

大げさな言葉
Meaning
speech or writing that is overly pompous and inflated
Example
His campaign speech was full of bombast but lacked real substance.
彼の選挙演説はボンバストに満ちていたが、実際の実質は欠けていた。
A2 verb /beɪk/

bake

焼く
Meaning
to cook food using dry heat, usually in an oven
Example
She baked a cake for her friend's birthday.
彼女は友達の誕生日のためにケーキを焼きました。
B2 noun, verb /ˈblækmeɪl/

blackmail

脅迫する
Meaning
the act of demanding money or advantage by threatening to reveal secrets; to force someone to act by using such threats
Example
He tried to blackmail her by threatening to reveal the documents.
彼は書類を公表すると脅して彼女を脅迫しようとした。
C2 noun /ˈblændɪʃmənt/

blandishment

お世辞
Meaning
flattering or pleasing statement or action used to persuade someone gently
Example
She used every blandishment to win his support.
彼女は彼の支持を得るためにあらゆるお世辞を使った。
B1 noun /ˈbed ʃiːt/

Bed sheet

ベッドシーツ
Meaning
a large rectangular piece of cloth used as bedding to lie on or under
Example
The clean white bed sheet felt soft against her skin.
清潔な白いベッドシーツは彼女の肌に柔らかく感じました。
C2 noun /ˈbɪlɪŋzˌɡeɪt/

billingsgate

粗野または侮辱的な言葉
Meaning
Coarse or abusive language; vulgar or offensive speech.
Example
The heated argument quickly descended into billingsgate.
激しい議論はすぐに粗野な言葉に変わった。
B1 verb /bæn/

ban

禁止する
Meaning
to officially forbid something; to prohibit
Example
The government banned smoking in public places.
政府は公共の場所での喫煙を禁止した。
C1 verb /bɔːk/

balk

拒否する
Meaning
to hesitate or refuse to proceed or comply
Example
She balked at signing the contract without reading it fully.
彼女は契約書を完全に読まずに署名することをためらった。
A2 noun /bɪər/

beer

ビール
Meaning
An alcoholic drink made from yeast-fermented malt flavored with hops.
Example
He ordered a glass of cold beer at the bar.
彼はバーで冷たいビールを注文した。
C2 noun /blɑːtʃ/

blotch

しみ
Meaning
a large, irregular spot or stain, often on skin or fabric
Example
His shirt had a red blotch from the spilled juice.
彼のシャツにはこぼれたジュースで赤いしみがついていた。
C1 noun /bəˈtɒn/

baton

Meaning
A thin stick carried by a conductor to direct an orchestra, or used as a symbol of authority.
Example
The conductor raised his baton to begin the symphony.
C2 noun /ˌbeɪˈliː/

bailee

受寄者
Meaning
a person or party who temporarily receives possession of goods or property from another under a legal agreement
Example
The bailee must take reasonable care of the goods while they are in his possession.
受寄者は財産を適切に管理する義務がある。
B2 verb /ˈbætər/

batter

繰り返し打つ
Meaning
To strike repeatedly with force.
Example
The waves battered the shoreline all night.
波が一晩中海岸を打ちました。
C1 noun, verb /bʌldʒ/

bulge

Meaning
A swelling or protruding part; to swell outward or protrude.
Example
The bag began to bulge with too many books inside.
B1 noun /ˈbeɪs.mənt/

Basement

地下室
Meaning
the lowest floor of a building, typically below ground level
Example
We store old furniture in the basement.
古い家具は地下室に保管されています。
C2 noun /ˈbrɪɡ.ənd/

brigand

山賊
Meaning
A member of a gang that ambushes and robs people in forests or mountains; a bandit.
Example
The travelers were attacked by brigands in the mountains.
旅行者は山中で山賊に襲われました。
A1 determiner/pronoun /boʊθ/

both

両方
Meaning
referring to two people or things together
Example
Both of the children were excited about the trip.
旅行について両方の子供たちは興奮していました。
B2 noun /ˈbjʊəroʊ/

bureau

事務所/機関
Meaning
An office or agency that provides services or manages specific duties.
Example
The travel bureau helped them plan their vacation.
旅行局は彼らが休暇の計画を立てるのを手伝った。
C1 verb /bɪˈlɪtl/

belittle

軽視する
Meaning
To make someone or something seem less important or less valuable.
Example
He often belittled his coworkers to feel superior.
彼はしばしば自分を優位に感じるために同僚を軽視していた。
B2 noun /buːˈtiːk/

boutique

ブティックショップ
Meaning
a small shop that sells fashionable clothes or accessories
Example
She bought a beautiful dress from a boutique downtown.
彼女はダウンタウンのブティックショップで美しいドレスを買いました。
B1 noun ˈbæl.ənst daɪ.ət

balanced diet

バランスの取れた食事
Meaning
A diet consisting of the proper quantities and proportions of foods needed to maintain health or growth.
Example
A balanced diet is essential for maintaining good health.
バランスの取れた食事は健康維持に不可欠です。
B1 noun /ˈbæŋkɪŋ/

banking

銀行業務または銀行サービス
Meaning
the business or services provided by a bank
Example
Online banking has made financial transactions easier.
オンラインバンキングは金融取引を簡単にしました。
C2 noun /ˈbrɛviˌɛri/

breviary

祈祷書
Meaning
A book containing the service for each day, used in Christian liturgy.
Example
The monk read from the breviary during morning prayers.
修道士は朝の祈りの間に祈祷書から読んでいました。
C2 adjective /ˈbiːstiəl/

bestial

獣のような
Meaning
Relating to beasts; showing savagery, brutality, or lacking human sensibility.
Example
The prisoners were treated in a bestial manner.
囚人たちは獣のような扱いを受けた。
C1 noun /bɪz/

Biz

ビジネス
Meaning
business (informal); commercial enterprise or activity
Example
He's been in the restaurant biz for twenty years.
彼は20年間、レストランのビジネスをしてきました。
C2 verb /bɪˈsmɪər/

besmear

汚す
Meaning
to smear or cover with a sticky or dirty substance; to soil
Example
His clothes were besmeared with mud.
彼の服は泥で汚れていた。
C2 adjective /ˈbɔːlki/

balky

頑固
Meaning
difficult, uncooperative, or stubborn
Example
The balky printer refused to work when needed most.
頑固なプリンターは最も必要な時に動作を拒否しました。
C2 noun /biˈætɪtjuːd/

beatitude

至高の幸福または祝福、しばしば山上の説教でのイエスの言葉に関連して使用される
Meaning
supreme blessedness or happiness, often used in reference to the sayings of Jesus in the Sermon on the Mount
Example
She felt a state of beatitude after receiving the good news.
良い知らせを受け取った後、彼女は幸福の状態を感じていた。
C2 noun /ˈbɑːr.bər/

Barbar

理髪師
Meaning
a person whose job is to cut men's hair and shave or trim beards
Example
The barber gave him a perfect haircut for his wedding.
理髪師は彼の結婚式のために完璧なヘアカットをしました。
B2 noun /ˈbæŋkrʌpt/

Bankrupt

破産
Meaning
a person unable to pay debts; having no money; completely lacking in something
Example
The company went bankrupt after years of poor financial management.
その会社は、長年の不良な財務管理の後、破産しました。
B1 noun /baɪˈɒlədʒi/

biology

生物学
Meaning
The scientific study of living organisms.
Example
Biology explains how plants and animals function.
生物学は植物や動物がどのように機能するかを説明します。
B1 noun /ˈboʊ.nəs/

Bonus

ボーナス
Meaning
an amount of money added to wages on a seasonal basis, especially as a reward for good performance
Example
She received a year-end bonus for her excellent work performance.
彼女は優れた仕事のパフォーマンスに対する年末ボーナスを受け取った。
B1 noun /ˈbʊt.ʃər/

Butcher

肉屋
Meaning
a person whose job is cutting up and selling meat in a shop
Example
The butcher recommended the best cut of beef for our dinner.
肉屋は私たちの夕食のために最高の牛肉の切り身を勧めました。
C2 noun /ˈbʊlrʌʃ/

bulrush

ヨシ
Meaning
A tall plant with long leaves that grows in or near water, also known as a cattail.
Example
The pond was surrounded by tall bulrushes swaying in the wind.
池は風に揺れる高いヨシで囲まれていました。
C2 verb /bɪˈstraɪd/

bestride

支配する
Meaning
To sit or stand astride something; to dominate over.
Example
The statue bestrides the city square.
その像は都市広場を支配しています。
A2 noun/verb /bəˈluːn/

balloon

風船
Meaning
A small bag made of thin rubber or similar material that can be inflated with air or gas; as a verb, to expand rapidly.
Example
The children played with a red balloon at the party.
子供たちはパーティーで赤い風船で遊んでいました。
C1 verb /bɪˈmoʊn/

bemoan

嘆く
Meaning
To express discontent or sorrow over something.
Example
Critics bemoaned the lack of diversity in the film.
批評家たちは映画の多様性の欠如を嘆いた。
C1 adjective /bɪˈriːvd/

Bereaved

悲嘆に暮れる
Meaning
having lost a loved one through death
Example
The bereaved family received many condolences.
悲嘆に暮れる家族は多くの弔辞を受け取った。
A1 verb (past participle of 'bear'), adjective /bɔːrn/

born

生まれた
Meaning
To come into life; brought into existence.
Example
He was born in Dhaka in 1995.
彼は1995年にダッカで生まれた。
C1 noun /ˈbɑːr.tər ˌsɪs.təm/

barter system

物々交換システム
Meaning
A system of exchange where goods and services are traded directly without using money.
Example
Ancient civilizations used the barter system for trade.
古代の文明は貿易のために物々交換システムを使用していました。
B1 noun /bɪˈliːf/

Belief

信念; 信頼
Meaning
confidence in the truth or existence of something; trust or faith
Example
His belief in justice never wavered.
彼の正義への信念は決して揺るがなかった。
C1 verb, noun /ˈbʌsəl/

bustle

騒々しさ、忙しさ
Meaning
to move in an energetic or noisy manner; busy activity in a place
Example
The marketplace bustled with vendors and customers.
市場は販売員と顧客で賑わっていた。
B2 noun /bɪˈliːvər/

believer

信者
Meaning
a person who believes in something, especially a religious faith, idea, or principle
Example
She is a strong believer in hard work and honesty.
彼女は努力と正直さを強く信じている。
C2 noun /ˌbʌkəˈnɪər/

buccaneer

海賊
Meaning
a pirate, especially one active in the Caribbean during the 17th and 18th centuries
Example
The buccaneer sailed across the Caribbean in search of treasure.
その海賊はカリブ海を航海し、宝物を探していた。
C2 adjective /bɪˈsɒtɪd/

besotted

夢中な、恋に狂った
Meaning
strongly infatuated or obsessed with someone or something
Example
He was completely besotted with her charm.
彼は彼女の魅力に完全に夢中だった。
C2 verb /bɪlk/

bilk

だます
Meaning
To cheat or defraud someone of money or rights.
Example
The scammer tried to bilk elderly people out of their savings.
詐欺師は高齢者の貯金をだまし取ろうとした。
C1 noun /bɪˈtreɪər/

Betrayer

裏切り者; 不忠者
Meaning
a person who betrays someone or something; one who is disloyal
Example
The betrayer was exposed and faced severe consequences.
裏切り者は暴露され、厳しい結果に直面しました。
B2 noun ˌbaɪ.oʊ.dɪˈvɝː.sə.t̬i

biodiversity

生物多様性
Meaning
The variety of life in the world or in a particular habitat or ecosystem.
Example
Rainforests are home to immense biodiversity.
熱帯雨林は膨大な生物多様性を持っています。