know something by heart
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idiom

know something by heart

把某事完全记住
Meaning
to memorize something perfectly
Example
She **knows all the poems by heart**.
她把所有的诗都背得滚瓜烂熟。
idiom

knock it out of the park

做某事极其出色或成功
Meaning
to do something extremely well or successfully
Example
Her presentation **knocked it out of the park**.
她的演讲 **做得非常出色**。
idiom

keep your eye on the ball

专注于你的目标
Meaning
to stay focused on your goal
Example
If you **keep your eye on the ball**, you’ll succeed.
如果你**专注于目标**，你就会成功。
idiom

kindred spirit

有相似兴趣或感情的人
Meaning
someone who has similar interests or feelings
Example
We became friends because we’re **kindred spirits**.
我们成为朋友是因为我们是志同道合的人。
idiom

Know something inside out

非常熟悉某事
Meaning
To know something very well
Example
She **knows the syllabus inside out**.
她非常熟悉这门课程。
idiom

keep a low profile

避免引起注意；保持冷静和不被注意
Meaning
to avoid attracting attention; to stay calm and unnoticed
Example
After the controversy, he decided to **keep a low profile**.
在争议之后，他决定保持低调。
idiom

keep someone at arm’s length

与某人保持距离
Meaning
to avoid getting too close to someone
Example
After the argument, I **kept him at arm’s length**.
争吵之后，我与他保持距离。
idiom

keep one's head above water

在困难时期经济上生存
Meaning
to survive financially in difficult times
Example
Many small businesses struggle to **keep their heads above water**.
许多小企业挣扎着**保持生存**。
idiom

Keep the team on track

确保团队保持专注和有组织
Meaning
to make sure the team remains focused and organized
Example
As the project manager, it's important to **keep the team on track**.
作为项目经理，确保 **保持团队在正轨上** 是非常重要的。
idiom

know the ropes

对某事非常熟悉；对某事有透彻理解
Meaning
to be very familiar with something; to have a thorough understanding of something
Example
He really **knows the ropes** in this field of work.
他在这个工作领域真的**非常熟悉**
idiom

key in on

专注于某个特定的事物
Meaning
to give focused attention to something specific
Example
The coach asked the team to **key in on** their defensive mistakes.
教练要求团队**专注于**他们的防守错误。
idiom

keep track of

持续监控或记录信息
Meaning
to monitor or record information consistently
Example
Use the shared sheet to **keep track of** expenses.
使用共享表格来跟踪支出。
idiom

keep your head in the game

保持精神集中并保持动力
Meaning
to stay mentally focused and motivated
Example
Even when things get tough, **keep your head in the game**.
即使事情变得困难，**保持专注在比赛中**。
idiom

keep your cool

在压力或挑衅下保持冷静
Meaning
to stay calm under stress or provocation
Example
Even in emergencies, he always **keeps his cool**.
即使在紧急情况下，他总是保持冷静。
idiom

knock someone for six

极大地震惊或使某人烦恼
Meaning
to shock or upset someone greatly
Example
The sudden loss **knocked him for six**.
突如其来的损失 **让他震惊**。
idiom

keep the momentum

保持势头
Meaning
to continue progressing without slowing down
Example
We need to **keep the momentum** to reach our target.
我们需要保持势头以实现我们的目标。
idiom

keep an eye out

仔细观察某事或某人
Meaning
to watch for something or someone carefully
Example
Can you **keep an eye out** for my package while I'm away?
我不在的时候，你能**注意**我的包裹吗？
idiom

Keep going

尽管面临困难，仍然坚持下去。
Meaning
Continue with determination despite difficulties.
Example
You're doing great—just **keep going**!
你做得很好——继续加油！
idiom

keep the home fires burning

在别人不在时维持幸福的家
Meaning
to maintain a happy home while others are away
Example
While her husband was abroad, she **kept the home fires burning**.
当她丈夫在国外时，她**保持了家的温暖**。
idiom

keep an eye on

小心地观察或监控某事或某人
Meaning
to watch or monitor something or someone carefully
Example
Can you **keep an eye on** the kids while I'm cooking?
你能在我做饭的时候**照看一下孩子们**吗？
idiom

Keep your head above water

设法在困难中生存或应对。
Meaning
Manage to survive or cope with difficulties.
Example
It’s hard, but I’m trying to **keep my head above water**.
很难，但我在尽力保持生存。
idiom

keep your shirt on

保持冷静；不要生气或不耐烦
Meaning
stay calm; don’t get angry or impatient
Example
**Keep your shirt on**, we’ll solve it soon.
保持冷静，我们很快就会解决它
idiom

Keep hope alive

继续相信一个积极的结果。
Meaning
To continue believing in a positive outcome.
Example
Even in hard times, we must **keep hope alive**.
即使在困难时刻，我们也必须**保持希望活着**。
idiom

keep away from

避免某人或某事
Meaning
to avoid someone or something
Example
You should **keep away from** sugary drinks right now.
你现在应该**远离含糖饮料**。
idiom

knock around

花时间做随意的活动
Meaning
to spend time doing casual activities
Example
We’ll **knock around** the city after the workshop.
我们将在工作坊之后在城市里闲逛。
idiom

Keep it real

保持诚实和真实。
Meaning
To stay honest and genuine.
Example
She always tries to **keep it real** in her relationships.
她总是努力在她的关系中**保持诚实和真实**。
idiom

Keep your friends close and your enemies closer

保持与朋友的良好关系非常重要，但理解你的敌人也同样重要。
Meaning
It's important to maintain good relationships with your friends, but it's equally important to understand your enemies.
Example
He always watches his competitors carefully because he believes in **keeping your friends close and your enemies closer**.
他总是小心地观察竞争对手，因为他相信**保持朋友在身边，敌人更靠近**。
idiom

keep your eyes peeled

保持警惕并仔细观察
Meaning
to stay alert and watch carefully
Example
Keep your eyes peeled for any signs of trouble.
注意任何问题的迹象。
idiom

kick up a fuss

对某事进行大规模的抱怨或抗议
Meaning
to make a big complaint or protest about something
Example
They **kicked up a fuss** when the restaurant ran out of food.
当餐厅的食物卖完时，他们大声抱怨起来。
idiom

keep the peace

维持秩序并避免冲突
Meaning
to maintain order and avoid conflict
Example
The police were called to **keep the peace** during the protest.
警方被叫来在抗议期间维持和平。
idiom

keep up with the Joneses

试图在财富或财产上与邻居或同龄人匹敌
Meaning
to try to match your neighbors or peers in wealth or possessions
Example
Many people go into debt trying to **keep up with the Joneses**.
许多人为了**keep up with the Joneses**而陷入债务。
idiom

keep the ball rolling

保持活动或过程进行
Meaning
to keep an activity or process going
Example
Let’s **keep the ball rolling** on this project.
让我们继续进行这个项目。
idiom

keep your emotions in check

控制你的情绪
Meaning
to control your emotions
Example
It's important to **keep your emotions in check** during a meeting.
在会议期间保持控制你的情绪是很重要的。
idiom

keep smiling

即使面对困难也保持愉快
Meaning
to stay cheerful even when facing difficulties
Example
Whatever happens, just **keep smiling**.
无论发生什么，保持微笑。
idiom

keep your eyes on the prize

尽管有困难，依然保持专注于目标
Meaning
to stay focused on your goal despite difficulties
Example
Even during tough times, she **kept her eyes on the prize**.
即使在困难时刻，她依然专注于自己的目标。
idiom

keep your nose clean

保持远离麻烦；行为得体
Meaning
to stay out of trouble; to behave properly
Example
He’s been **keeping his nose clean** since he got that new job.
自从他得到那份新工作以来，他一直保持远离麻烦。
idiom

keep the dream alive

继续为目标工作或追求，即使遭遇困难
Meaning
to continue to hope or work toward a goal even after setbacks
Example
Even after the failure, they **kept the dream alive**.
即使失败，他们依然坚持着实现自己的梦想。
idiom

Keep fighting

继续奋斗；不要放弃。
Meaning
Continue striving; don’t give up.
Example
No matter what happens, just **keep fighting**.
无论发生什么，都要继续奋斗。
idiom

Keep a cool head

保持冷静，不要过于情绪化
Meaning
to remain calm and not get too emotional
Example
In a crisis, it's important to **keep a cool head**.
在危机中，保持冷静非常重要。
idiom

Keep the tradition alive

继续实践一个习俗，以免它被遗忘
Meaning
To continue practicing a custom so that it is not forgotten
Example
Every year we celebrate this festival to **keep the tradition alive**.
每年我们都会庆祝这个节日，以**保持传统活力**。
idiom

keep someone’s word

做你承诺的事情
Meaning
to do what you promise to do
Example
You can trust him; he always **keeps his word**.
你可以信任他；他总是**信守承诺**。
idiom

keep it up

继续做好某事
Meaning
to continue doing something well
Example
You’re doing great with your studies—**keep it up**!
你在学业上做得很好——**继续加油**！
idiom

keep tabs on

密切关注某人或某事
Meaning
to monitor someone or something closely
Example
I try to **keep tabs on** industry trends.
我尽量密切关注行业趋势。
idiom

keep something to yourself

不要告诉任何人某事
Meaning
not tell anyone about something
Example
Please **keep it to yourself** until we’re ready to announce.
请**保密**，直到我们准备好宣布。
idiom

keep in mind

记住一些重要的事情
Meaning
to remember something important
Example
**Keep in mind** that deadlines are strict.
记住，最后期限是严格的。
idiom

kill someone with kindness

以额外的友善对待一个不愉快的人，以中和他们的负面情绪
Meaning
to be extra kind to someone unpleasant to neutralize their negativity
Example
The best way to deal with her is to **kill her with kindness**.
与她打交道的最佳方式是以**友善的态度对待她**。
idiom

keep your mind on

专注于任务或目标
Meaning
to stay focused on a task or goal
Example
If you **keep your mind on** your studies, you’ll do well.
如果你**保持你的心思**在学习上，你会做得很好。
idiom

keep your fingers crossed

希望好运
Meaning
to hope for good luck
Example
I am **keeping my fingers crossed** for the exam results.
我为考试结果祈祷好运。
idiom

keep it under wraps

保密某事
Meaning
to keep something secret
Example
We’re trying to **keep it under wraps** until the official announcement.
我们正在努力保密，直到正式公告。
idiom

keep your cards close to your chest

保持你的计划或意图秘密
Meaning
to keep your plans or intentions secret
Example
She always **keeps her cards close to her chest** during negotiations.
她在谈判中总是把自己的底牌藏得很紧。
idiom

Keep fighting the good fight

即使面临挑战，也要继续努力。
Meaning
Continue your efforts even when facing challenges.
Example
You may not see results yet, but **keep fighting the good fight**.
你可能还看不到结果，但**继续努力**。
idiom

keyboard warrior

在线发布攻击性或愤怒评论的人
Meaning
someone who posts aggressive or angry comments online
Example
He acts tough online, but he’s just a **keyboard warrior**.
他在线上表现得很强硬，但他只是一个**键盘战士**。
idiom

keep up with the times

保持更新或适应现代趋势
Meaning
to stay updated or adapt to modern trends
Example
In the fast-moving tech industry, companies must **keep up with the times**.
在快速发展的科技行业中，公司必须跟上时代的步伐。
idiom

know someone inside out

非常了解某人
Meaning
to know someone very well
Example
I **know her inside out**; we’ve been friends for years.
我非常了解她；我们已经是多年的朋友了。
idiom

knuckle down

开始努力工作，特别是在拖延之后
Meaning
to start working hard, especially after delaying
Example
It’s time to **knuckle down** and finish this report.
是时候**开始努力工作**并完成这份报告了。
idiom

kind words cost nothing

善良不需要花费努力或金钱
Meaning
being kind doesn’t take effort or money
Example
Remember, **kind words cost nothing**.
记住，善良的话不花任何代价。
idiom

kindness goes a long way

一小个善举可能带来巨大的积极影响
Meaning
a small act of kindness can have a big positive impact
Example
Remember, **kindness goes a long way** in building good relationships.
记住，**善良有很大的作用**在建立好关系时。
idiom

keep one's cards close to the chest

将计划或意图保密
Meaning
to keep one's plans or intentions secret
Example
During the negotiations, she **kept her cards close to the chest**.
在谈判期间，她**保持了自己的卡片靠近胸部**。
idiom

keep faith with someone

对某人或某事保持忠诚
Meaning
to remain loyal to someone or something
Example
Even in hard times, she **kept faith with** her friends.
即使在困难时期，她也保持了对朋友的忠诚。
idiom

keep in touch

与某人保持沟通
Meaning
to maintain communication with someone
Example
Even after moving away, we **keep in touch** regularly.
即使搬走了，我们仍然保持定期**联系**。
idiom

keep a straight face

在有趣的情况下避免笑出声
Meaning
to avoid laughing in a funny situation
Example
It was hard to **keep a straight face** during his silly speech.
在他愚蠢的演讲过程中，很难保持严肃的表情。
idiom

kick back

放松一下，暂时什么都不做
Meaning
to relax and do nothing for a while
Example
After finishing the project, we just **kicked back** and watched a movie.
完成项目后，我们就放松地看了一部电影。
idiom

kick the bucket

死（非正式）
Meaning
to die (informal)
Example
He finally **kicked the bucket** after a long illness.
他终于在长时间的疾病后**去世了**。
idiom

Know your stuff

对某事有知识或技能
Meaning
to be knowledgeable or skilled about something
Example
You can tell she really **knows her stuff** about physics.
你可以说她对物理学真的很了解。
idiom

kingmaker

一个在决定谁将拥有权力方面具有巨大影响力的人
Meaning
a person who has great influence in deciding who will hold power
Example
The media mogul became a **kingmaker** in national politics.
这位媒体大亨成为了国家政治中的一个**kingmaker**。
idiom

Keep going strong

坚持不懈，不放弃
Meaning
to keep persevering and not give up
Example
Even when times are tough, remember to **keep going strong**.
即使在困难的时候，也要记得 **坚持不懈地前进**。
idiom

kick the habit

停止做坏事或有成瘾性的事情
Meaning
to stop doing something bad or addictive
Example
After ten years of smoking, he finally **kicked the habit**.
吸烟十年后，他终于戒掉了这个习惯。
idiom

keep your nose to the grindstone

努力工作并持续不断
Meaning
to work hard and continuously
Example
If you **keep your nose to the grindstone**, you’ll achieve your goals.
如果你**保持在磨石上工作**，你将实现你的目标。
idiom

kick around

非正式地讨论想法
Meaning
to discuss ideas informally
Example
We can **kick around** some concepts after lunch.
我们可以在午餐后讨论一些概念。
idiom

kill time

在等待时做某事
Meaning
to do something while waiting
Example
We played cards to **kill time** before the show started.
我们玩牌来**打发时间**，直到节目开始。
idiom

Keep one’s eye on the ball

专注于实现目标。
Meaning
To stay focused on achieving a goal.
Example
If you **keep your eye on the ball**, you’ll surely succeed.
如果你专注于目标，你一定会成功。
idiom

keep the fire burning

保持火焰
Meaning
to stay motivated and passionate about something
Example
Even after failure, he managed to **keep the fire burning**.
即使失败后，他仍然能够保持火焰。
idiom

Know the drill

熟悉某个例程或程序。
Meaning
To be familiar with a routine or procedure.
Example
Everyone here **knows the drill** during an emergency.
这里每个人都知道在紧急情况下该做什么。
idiom

keep out

防止某人或某物进入
Meaning
to prevent someone or something from entering
Example
Close the windows to **keep out** the dust during the renovation.
在翻新期间，关上窗户以防止灰尘进入。
idiom

kick off

开始一个事件或活动
Meaning
to start an event or activity
Example
The workshop will **kick off** at 9 a.m. sharp.
研讨会将在上午9点准时开始。
idiom

kill two birds with one stone

一箭双雕
Meaning
to succeed in achieving two things in a single action
Example
I can **kill two birds with one stone** by listening to a podcast while I exercise.
我可以 **一箭双雕**，一边听播客一边锻炼。
idiom

Keep an open mind

愿意考虑新的想法或意见。
Meaning
To be willing to consider new ideas or opinions.
Example
Try to **keep an open mind** when learning about different cultures.
在了解不同文化时，尝试保持**开放的心态**。
idiom

kick out

强迫某人离开
Meaning
to force someone to leave
Example
Security **kicked out** the rowdy fans before the end.
保安在结束前**踢出了**吵闹的球迷。
idiom

keep your word

遵守诺言或承诺
Meaning
to honor a promise or commitment
Example
You must always **keep your word** if you want to gain trust.
如果你想获得信任，你必须始终遵守诺言。
idiom

keep body and soul together

努力生存或幸存
Meaning
to manage to stay alive or survive
Example
He worked day and night just to **keep body and soul together**.
他日夜工作只是为了**活下来**。
idiom

keep faith

保持信念
Meaning
to continue believing in something or someone
Example
Even in tough times, you must **keep faith**.
即使在困难时期，你也必须保持信念。
idiom

keep up with

保持与某事或某人相同的水平或保持知情
Meaning
to stay informed or at the same level as something or someone
Example
It's hard to **keep up with** the latest tech trends.
很难跟上最新的科技趋势。
idiom

Keep an even keel

保持冷静和稳定，尤其在困难时期。
Meaning
To stay calm and steady, especially during difficulties.
Example
Despite the pressure, she **kept an even keel** throughout the project.
尽管面临压力，她在整个项目中保持冷静。
idiom

keep an eye on someone

仔细观察某人，因为你不完全信任他们
Meaning
to watch someone carefully because you don’t trust them completely
Example
I’ll **keep an eye on him** while you’re away.
当你不在时，我会**盯着他**。
idiom

Keep it under your hat

保持某事秘密。
Meaning
To keep something secret.
Example
I’ll tell you a secret, but **keep it under your hat**.
我会告诉你一个秘密，但**保密**。
idiom

keep one's nose to the grindstone

努力工作并持续不断地工作
Meaning
to work hard and continuously
Example
If you **keep your nose to the grindstone**, you'll achieve your goals.
如果你**保持不断努力工作**，你将实现你的目标。
idiom

kiss and make up

吵架后重新和好
Meaning
to become friends again after an argument
Example
They always **kiss and make up** after every fight.
他们每次吵架后都会和好。
idiom

keep one's word

做自己承诺做的事情
Meaning
to do what one has promised to do
Example
He always **keeps his word**, no matter what.
他总是遵守诺言，无论发生什么。
idiom

keep your options open

推迟做出最终决定，以便保留选择
Meaning
to delay making a final decision so you have choices
Example
I’ll **keep my options open** until I hear back from all the universities.
我会**保持我的选择开放**，直到我收到所有大学的回复。
idiom

keep on track

按照计划继续做某事
Meaning
to continue doing something as planned
Example
We need to **keep on track** to meet our deadlines.
我们需要**保持进度**以赶上最后期限。
idiom

Know it all

一个表现得像是知道一切的人。
Meaning
Someone who acts as if they know everything.
Example
He’s such a **know it all**, it’s annoying.
他是一个**自以为是的人**，这让人讨厌。
idiom

keep moving forward

尽管有障碍或挫折，也要继续前进
Meaning
to continue progressing despite obstacles or setbacks
Example
No matter what happens, always **keep moving forward**.
无论发生什么，都要继续前进。
idiom

keep things bottled up

不表达你的情感或担忧
Meaning
to not express your emotions or worries
Example
He tends to **keep things bottled up** instead of talking about them.
他倾向于**把事情闷在心里**，而不是谈论它们。
idiom

key in

使用键盘或数字键盘输入数据
Meaning
to enter data using a keyboard or keypad
Example
Please **key in** your code before the door locks.
请在门锁之前输入您的代码。
idiom

kick in

开始生效
Meaning
to begin to take effect
Example
The backup generator should **kick in** within seconds.
备份发电机应在几秒钟内**启动**。
idiom

keep on keeping on

尽管面临挑战，仍然继续做某事
Meaning
to continue doing something despite challenges
Example
It’s tough, but you have to **keep on keeping on**.
这很困难，但你必须**继续下去**。
idiom

keep it together

在困难时刻保持冷静
Meaning
to stay composed during difficult times
Example
Even after hearing the bad news, he managed to **keep it together**.
即使在听到坏消息后，他也能够保持冷静。
idiom

Keep at it

继续尝试，即使很困难。
Meaning
Continue trying even when it’s hard.
Example
Don’t give up—just **keep at it**.
不要放弃—继续努力。
idiom

knock your socks off

极大地打动或惊讶某人
Meaning
to impress or surprise someone greatly
Example
The concert will **knock your socks off**!
音乐会将 **让你大吃一惊**！
idiom

keep all your eggs in one basket

依赖于单一的计划或成功的来源
Meaning
to rely on a single plan or source of success
Example
Don’t **keep all your eggs in one basket** when investing.
投资时不要把所有的鸡蛋放在一个篮子里。
idiom

keep your eye on the prize

尽管有障碍，仍然专注于你的目标
Meaning
to stay focused on your goal or objective despite obstacles
Example
Even though the road was tough, he always **kept his eye on the prize** and succeeded.
尽管路途艰难，他始终紧盯着目标并取得了成功。
idiom

keep someone's secret

保守别人告诉你的秘密
Meaning
to not tell others what someone has told you in confidence
Example
You can trust me—I’ll **keep your secret**.
你可以相信我——我会保守你的秘密。
idiom

kick up your heels

通过跳舞或庆祝来享受自己
Meaning
to enjoy yourself by dancing or celebrating
Example
Everyone was ready to **kick up their heels** at the reunion.
每个人都准备在聚会上尽情享受。
idiom

keep your chin up

在困难的情况下保持积极，并且不要失去希望
Meaning
to stay positive and not lose hope in difficult situations
Example
**Keep your chin up**; things will get better soon.
抬起头来；事情很快就会好起来。
idiom

keep things in perspective

通过现实地看待事物保持冷静
Meaning
to stay calm by seeing things realistically
Example
When stressed, try to **keep things in perspective**.
当感到压力时，试着**保持事情的视角**。
idiom

keep a stiff upper lip

在困难的情况下不表现出情绪
Meaning
to not show your emotions in difficult situations
Example
Even after losing the match, the team **kept a stiff upper lip**.
即使输掉比赛，团队仍保持镇定。
idiom

keep something under wraps

将某事保密
Meaning
to keep something secret
Example
They managed to **keep the project under wraps** until the launch day.
他们成功地**将项目保密**直到发布日。
idiom

key into

密切关注或理解某个重要的事情
Meaning
to pay close attention to or understand something important
Example
Leaders must **key into** what customers value most.
领导者必须了解客户最看重的东西。
idiom

keep your dreams alive

即使困难，也要继续相信自己的目标
Meaning
to continue believing in your goals even when it's hard
Example
No matter how tough life gets, **keep your dreams alive**.
无论生活多么艰难，**保持你的梦想活着**。
idiom

Keep the faith

继续相信事情会好转。
Meaning
Continue to believe that things will work out.
Example
Even in hard times, **keep the faith**.
即使在困难时期，**保持信念**。
idiom

keep your head up

在困境中保持自信和坚强
Meaning
to remain confident and strong during hardships
Example
**Keep your head up**, better days are coming.
**抬起头来**, 更好的日子即将到来。
idiom

Keep someone posted

让某人了解某事。
Meaning
To keep someone informed about something.
Example
Please **keep me posted** about any updates.
请**保持我更新**任何最新的进展。