decoy
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C1 noun/verb /ˈdiːkɔɪ/

decoy

Meaning
something or someone used to lure or mislead
Example
The hunters used a wooden duck as a decoy.
C1 adjective /dɪˈfɪʃənt/

Deficient

Meaning
not having enough of a specified quality or ingredient; lacking or inadequate
Example
His diet was deficient in essential vitamins.
C1 noun /ˈdaʊn.pɔːr/

Downpour

Meaning
a heavy fall of rain; a sudden heavy rainfall
Example
The sudden downpour caught everyone off guard and soaked the outdoor event.
C1 verb /dɪˈsɛləˌreɪt/

decelerate

Meaning
to reduce speed; to slow down
Example
The car began to decelerate as it approached the traffic light.
C1 noun /ˈdrɪz.əl/

Drizzle

Meaning
light rain falling in very fine drops; a very light rainfall
Example
The gentle drizzle continued throughout the morning, making everything misty.
C1 adjective /ˈdɑːsəl/ or /ˈdəʊsaɪl/

docile

Meaning
easily managed, taught, or controlled; submissive
Example
The docile puppy quickly learned new tricks.
C1 adjective /drəˈkoʊniən/

draconian

Meaning
Extremely harsh and severe, especially laws or rules.
Example
The new regulations were criticized as draconian.
C1 verb /diːm/

deem

Meaning
to regard or consider in a specified way
Example
The project was deemed a success by the board.
C1 adjective /dɪˈbɪl.ɪ.teɪ.tɪŋ/

debilitating

Meaning
Making someone or something weak and infirm.
Example
The disease had a debilitating effect on his health.
C1 adjective /dɪˈplɔːrəbl/

deplorable

Meaning
deserving strong condemnation; shockingly bad in quality
Example
The refugees were living in deplorable conditions.
C1 adjective /daɪər/

Dire

Meaning
extremely serious; urgent; terrible
Example
The country is facing a dire economic crisis.
C1 verb /dɪˈsɛnt/

dissent

Meaning
To hold or express opinions that are different from those officially accepted.
Example
Several members dissented from the majority decision.
C1 adjective /dɪsˈsɪmɪlər/

dissimilar

Meaning
Not alike; different.
Example
Though they are twins, their personalities are dissimilar.
C1 noun, adjective /dɪˈfiːtɪst/

defeatist

Meaning
A person who expects or is excessively ready to accept failure; showing a tendency to expect defeat.
Example
His defeatist attitude discouraged the rest of the team.
C1 noun /ˌdɪfəˈrɛnʃɪˈeɪʃən/

differentiation

Meaning
The action or process of differentiating or distinguishing between things.
Example
Differentiation from competitors can create a unique market position.
C1 noun /ˌdɪp.ləˈmæt.ɪk ˈmaɪl.stəʊn/

diplomatic milestone

Meaning
A significant achievement or important event in diplomatic relations.
Example
Hosting the summit was a diplomatic milestone.
C1 noun /dɪˈrɪʒən/

derision

Meaning
Contemptuous ridicule or mockery.
Example
His ideas were greeted with derision by the audience.
C1 verb /ˈdrɪbəl/

dribble

Meaning
to let liquid flow slowly in drops or to move a ball skillfully with repeated small kicks or bounces
Example
The baby dribbled milk on his shirt.
C1 adjective /dɪˈvaʊt/

devout

Meaning
Deeply religious or sincere.
Example
He is a devout believer who prays every day.
C1 adjective /ˌdɪktəˈtɔːriəl/

dictatorial

Meaning
Having or showing a tendency to tell people what to do in an autocratic way.
Example
His dictatorial style made him unpopular among colleagues.
C1 verb /diːˈfjuːz/

defuse

Meaning
To make a situation less dangerous, tense, or explosive; to remove a fuse from a bomb.
Example
The negotiator helped defuse the tense situation.
C1 noun /ˌdɪsbɪˈliːvər/

disbeliever

Meaning
a person who does not believe in something, especially a religion or idea
Example
He was called a disbeliever for rejecting the traditional faith.
C1 adjective /ˈdeɪnti/

dainty

Meaning
Delicately small, pretty, and often considered elegant.
Example
She wore a dainty necklace made of pearls.
C1 verb /ˈdɛsɪmeɪt/

decimate

Meaning
To destroy or kill a large proportion of something.
Example
The wildfire decimated the forest.
C1 verb /dɪsˈpruːv/

disprove

Meaning
to show that something is false or wrong
Example
The scientist worked hard to disprove the old theory.
C1 adjective /dɪˈraɪsɪv/

derisive

Meaning
Expressing contempt or ridicule.
Example
She gave a derisive laugh at his attempt to sing.
C1 noun /ˈdrʌdʒəri/

drudgery

Meaning
Hard, menial, or dull work.
Example
She wanted to escape the drudgery of her daily routine.
C1 noun /draɪ fɪʃ/

Dry fish

Meaning
fish that has been preserved by drying in the sun or by other dehydration methods
Example
Dry fish is a popular preserved food in many coastal regions.
C1 verb /dɪsˈpleɪs/

displace

Meaning
to force someone or something out of their usual or original position; to replace or substitute
Example
The new technology will displace many traditional manufacturing jobs.
C1 adjective /ˈdek.stər.əs/

dexterous

Meaning
Showing or having skill, especially with the hands; mentally adroit and skillful.
Example
A dexterous programmer can write complex codes effortlessly.
C1 adjective /ˈdwɪndlɪŋ/

dwindling

Meaning
Gradually reducing in number, size, or strength.
Example
The villagers relied on dwindling water supplies.
C1 noun ˈdɛtrɪ.mənt

detriment

Meaning
Harm, damage, impairment.
Example
Smoking is a detriment to health.
C1 noun /dɪˈsɜːn.mənt/

discernment

Meaning
The ability to judge well or understand something correctly; keen insight.
Example
His discernment in business decisions made him successful.
C1 noun /ˈdɪsənˌtɛri/

dysentery

Meaning
An infection of the intestines resulting in severe diarrhea with blood and mucus.
Example
Many soldiers suffered from dysentery during the war.
C1 noun /ˈdɛsɪˌbɛl/

decibel

Meaning
a unit used to measure the intensity of sound
Example
The noise level in the factory exceeded 90 decibels.
C1 verb /dəˈmɛstɪkeɪt/

domesticate

Meaning
to tame an animal for use by humans; to adapt something for domestic use
Example
Humans domesticated dogs thousands of years ago.
C1 noun /dɪˈfaɪəns/

defiance

Meaning
Open resistance or bold disobedience.
Example
The protest was an act of defiance against injustice.
C1 noun /ˈdɪsɪdənt/

dissident

Meaning
A person who opposes official policy, especially that of an authoritarian state.
Example
The dissident was arrested for speaking against the government.
C1 adjective /ˈdɪzməl/

Dismal

Meaning
gloomy; depressing; causing sadness or despair
Example
The weather was dismal with heavy rain and dark clouds.
C1 noun /ˌdɪs.ɪˈluː.ʒən.mənt/

disillusionment

Meaning
A feeling of disappointment resulting from the discovery that something is not as good as one believed it to be.
Example
Many people experience disillusionment after unrealistic expectations.
C1 adjective /dɪˈfaɪənt/

Defiant

Meaning
boldly resistant or challenging; disobedient
Example
The defiant student refused to follow the rules.
C1 noun ˌdɛməˈɡræfɪk trænˈzɪʃən

demographic transition

Meaning
A shift in population patterns from high birth and death rates to low birth and death rates as a country develops economically
Example
The demographic transition indicates a shift towards an aging society.
C1 noun /ˈdek.ə.dəns/

decadence

Meaning
Moral or cultural decline characterized by excessive indulgence in pleasure or luxury.
Example
The novel describes the decadence of the wealthy elite.
C1 noun /ˌdɪs.əˈreɪ/

disarray

Meaning
A state of disorganization or untidiness; confusion or disorder.
Example
His desk was in complete disarray.
C1 verb /daɪˈleɪt/

dilate

Meaning
To make wider, larger, or more open.
Example
The doctor used drops to dilate the patient's pupils.
C1 adjective /ˌdɪfəˈrɛnʃəl/

differential

Meaning
Relating to or showing a difference; involving a distinction.
Example
There is a differential treatment between the two groups.
C1 verb /dɪˈfɔːrm/

deform

Meaning
to change the shape or form of something, especially in a way that makes it ugly or damaged; to distort
Example
The intense heat began to deform the plastic container.
C1 verb /dɪˈbeɪs/

debase

Meaning
to reduce the quality, value, or dignity of something
Example
Corruption can debase the values of a society.
C1 noun ˌdiːˌrɛɡ.jʊˈleɪ.ʃən

deregulation

Meaning
The removal or reduction of government regulations in an economic sector.
Example
Deregulation has increased competition in the telecommunications sector.
C1 verb /dɪˈpliːt/

deplete

Meaning
to reduce the quantity or supply of something
Example
The long war has depleted the country's resources.
C1 verb /dɪˈfrɔːd/

defraud

Meaning
to illegally take money or valuables from someone by deception
Example
The company was accused of trying to defraud investors.
C1 noun /dɪˈmaɪz/

demise

Meaning
Death or end of something, especially the end of an institution or system.
Example
The sudden demise of the company shocked investors.
C1 noun /ˈdeɪˌbreɪk/

daybreak

Meaning
The time in the morning when daylight first appears; dawn.
Example
They set out on their journey at daybreak.
C1 adjective /dɪˈspɪkəbl/

despicable

Meaning
Deserving hatred and contempt; vile or shameful.
Example
His despicable actions shocked the entire community.
C1 noun delˈteɪɪk ˈlændskeɪp

deltaic landscape

Meaning
A geographical area formed by sediment deposits at the mouth of a river, creating a triangular land formation.
Example
Bangladesh has a unique deltaic landscape.
C1 noun dɪˌlɪb.əˈreɪ.ʃən

deliberation

Meaning
Long and careful consideration or discussion.
Example
The agreement was finalized after much deliberation.
C1 noun /ˌdɛməˈlɪʃən/

demolition

Meaning
the act or process of destroying a building or structure
Example
The demolition of the old factory took several weeks.
C1 noun /dɪˈfɛkʃən/

defection

Meaning
The act of abandoning one’s country, cause, or group in favor of another.
Example
The politician’s defection shocked his supporters.
C1 noun /ˌdɜːrməˈtɑːlədʒɪst/

dermatologist

Meaning
A doctor who specializes in the treatment of skin diseases.
Example
She consulted a dermatologist for her skin allergy.
C1 noun /dɪˈsiːt/

Deceit

Meaning
the action or practice of deceiving someone by concealing or misrepresenting the truth
Example
His deceit was discovered when the truth about his qualifications came to light.
C1 adjective /ˈdraʊ.zi/

Drowsy

Meaning
feeling sleepy and lethargic; half asleep; tired
Example
I felt drowsy after the heavy meal.
C1 noun dɪˈsʌɪsɪvnɪs

decisiveness

Meaning
The ability to make decisions quickly and effectively.
Example
His decisiveness during the crisis saved the company.
C1 noun /deɪˈbɑː.kəl/

debacle

Meaning
A sudden and ignominious failure; a fiasco.
Example
The company's poor management led to a financial debacle.
C1 verb /dɪsˈhɑːrtn/

dishearten

Meaning
to cause someone to lose determination or confidence; to discourage
Example
The constant rejection letters began to dishearten the young writer.
C1 noun /dɪsˈsɜːrvɪs/

disservice

Meaning
A harmful action; something that does damage rather than help.
Example
Spreading false information is a disservice to the community.
C1 adjective /dɪˈlɪriəs/

delirious

Meaning
in an extremely disturbed or excited state of mind, often due to illness or emotion
Example
He was delirious with fever and kept muttering nonsense.
C1 noun ˌdɪs.æmˌbɪɡ.juˈeɪ.ʃən

disambiguation

Meaning
The removal of ambiguity by making something clear and unambiguous.
Example
The AI system applies disambiguation to refine text understanding.
C1 adjective /dæft/

daft

Meaning
Silly or foolish.
Example
It was a daft idea to go hiking without water.
C1 adjective deft

deft

Meaning
Neatly skillful and quick in one's movements; dexterous and adroit.
Example
The artist's deft hands created a masterpiece.
C1 verb /dɪˈfaɪl/

defile

Meaning
to pollute, corrupt, or make dirty
Example
The river was defiled by industrial waste.
C1 adjective /dɪsˈkɔːrdənt/

discordant

Meaning
disagreeing or clashing; harsh and jarring in sound
Example
The discordant notes of the band hurt our ears.
C1 verb /dɪˈmiːn/

demean

Meaning
to cause someone to lose dignity or respect
Example
The manager demeaned his employees with rude remarks.
C1 verb /dɪˈdjuːs/

deduce

Meaning
to reach a conclusion by reasoning or inference
Example
From the evidence, the detective deduced that the suspect was lying.
C1 adjective /daɪˈvɜːrsɪfaɪd/

diversified

Meaning
Made or having variety in form, nature, or content.
Example
The company adopted a diversified business strategy to reduce risks.
C1 noun /ˈdaɪəˌlɛkt/

dialect

Meaning
A particular form of a language spoken in a specific region or by a specific group.
Example
He speaks a dialect of Bengali that is common in rural areas.
C1 verb dɪˈsaɪ.fɚ

decipher

Meaning
To convert something written in code into normal language; to succeed in understanding the meaning of something.
Example
It took hours to decipher the ancient script.
C1 noun /ˌdiːˈmer.ɪt/

Demerit

Meaning
a fault or disadvantage; a mark given for a fault or offense
Example
The student received a demerit for arriving late to class repeatedly.
C1 verb /dɪˈpɔːrt/

deport

Meaning
To expel a foreigner from a country, usually for legal or political reasons.
Example
The government decided to deport the illegal immigrants.
C1 verb /daɪˈɡrɛs/

digress

Meaning
To leave the main subject temporarily in speech or writing.
Example
The professor began to digress from the main topic of the lecture.
C1 verb /dɔːnt/

daunt

Meaning
to make someone feel intimidated, discouraged, or less confident
Example
The steep climb did not daunt the experienced hikers.
C1 verb /dɪˈmɔrəˌlaɪz/

demoralize

Meaning
to cause someone to lose confidence or hope
Example
The constant criticism demoralized the young athlete.
C1 noun /ˌdɛrɪˈveɪʃən/

derivation

Meaning
The origin or development of something from a source.
Example
The derivation of the word comes from Latin.
C1 noun /ˈdel.ɪ.kə.si/

Delicacy

Meaning
fineness of texture or structure; a choice or expensive food; sensitivity in handling
Example
The chef prepared a local delicacy that was famous throughout the region.
C1 noun /ˈdiːvə/

diva

Meaning
a famous female singer; a woman who is admired or behaves like a star
Example
The pop diva performed her latest hit to a cheering crowd.
C1 adjective /dɪˈklærətɪv/

declarative

Meaning
relating to a statement that declares something; in grammar, a sentence that makes a statement
Example
A declarative sentence simply states a fact or opinion.
C1 noun /dɪˌnɒmɪˈneɪʃən/

denomination

Meaning
a recognized autonomous branch of the Christian Church; a unit of value or currency
Example
The church belongs to a Protestant denomination.
C1 noun /ˌdɪsərˈteɪʃən/

dissertation

Meaning
A long piece of writing on a particular subject, usually written for a university degree.
Example
She spent two years writing her doctoral dissertation.
C1 noun /dɪˈprɛsənt/

depressant

Meaning
A drug that reduces functional or nervous activity in the body.
Example
Alcohol acts as a depressant on the central nervous system.
C1 noun dɛkˈstɛr.ɪ.ti

dexterity

Meaning
Skill in performing tasks, especially with the hands; mental skill or adroitness.
Example
His dexterity in playing the piano amazed the audience.
C1 noun ˌdɛɡrəˈdeɪʃən

degradation

Meaning
The condition or process of degrading or being degraded.
Example
Soil degradation due to overuse is a growing issue.
C1 verb /dɪˈflɛkt/

deflect

Meaning
to cause something to change direction; to avoid answering directly
Example
The shield deflected the incoming arrow.
C1 noun /ˌdɪs.kʌl.əˈreɪ.ʃən/

discoloration

Meaning
The process of changing or losing color; fading.
Example
Sun exposure causes discoloration of fabrics.
C1 noun /ˈdɛljuːdʒ/

deluge

Meaning
A severe flood; an overwhelming quantity of something.
Example
The town was hit by a deluge of rain in just a few hours.
C1 adjective /dɪˈsɜːrnɪŋ/

discerning

Meaning
having good judgment or insight; able to distinguish well
Example
He is a discerning reader who notices subtle details.
C1 noun /diːˌtɒksɪfɪˈkeɪʃən/

detoxification

Meaning
The process of removing toxic substances from a living organism.
Example
Detoxification helps to cleanse the body of harmful substances.
C1 adjective /ˈdaʊ.ər/

dour

Meaning
relentlessly severe, stern, or gloomy in manner or appearance
Example
His dour expression made the meeting uncomfortable.
C1 verb /ˌdiː.kəmˈprɛs/

decompress

Meaning
To relax and recover from stress or pressure.
Example
Taking deep breaths helps to decompress after a stressful day.
C1 noun /ˈderˌdevəl/

daredevil

Meaning
A person who enjoys doing dangerous or risky things.
Example
The stunt was performed by a famous daredevil.
C1 verb, noun /ˌdɪsɪˈluːʒən/

disillusion

Meaning
to cause someone to realize that something is not as good as they believed
Example
The scandal disillusioned many voters.
C1 noun /dɪˈfɪʃ.ən.si/

Deficiency

Meaning
a lack or shortage of something; inadequacy or insufficiency
Example
The doctor diagnosed a vitamin D deficiency in the patient's blood test.
C1 noun /ˌdiː.viˈeɪ.ʃən/

Deviation

Meaning
the action of departing from an established course; a departure from usual standards
Example
Any deviation from the established procedure must be reported immediately.
C1 noun /ˌdɛsɪˈmeɪʃən/

decimation

Meaning
The act of destroying or killing a large proportion of something.
Example
The decimation of the city left thousands homeless.
C1 noun/verb /dɪsˈdeɪn/

disdain

Meaning
The feeling that someone or something is unworthy of respect; to regard with contempt.
Example
She looked at the messy room with open disdain.
C1 verb /dɪˈɡreɪd/

degrade

Meaning
To lower in dignity, quality, or value; to treat with disrespect or to deteriorate.
Example
Harsh words can degrade a person's confidence.
C1 noun/verb /dɛnt/

dent

Meaning
a small hollow mark on the surface of something; to make a small hollow mark
Example
The accident left a dent in the car door.
C1 verb /dɪˈspɛl/

dispel

Meaning
to make a doubt, feeling, or belief disappear
Example
The teacher's explanation dispelled the students' confusion.
C1 verb /dɪˈteɪn/

detain

Meaning
to keep someone from proceeding; to hold back, especially by official authority
Example
The police detained the suspect for questioning.
C1 noun /dɪˌsem.ɪˈneɪ.ʃən/

dissemination

Meaning
The action or fact of spreading something, especially information, widely.
Example
The dissemination of false information is a major issue.
C1 verb /dɪsˈpærɪdʒ/

disparage

Meaning
to criticize someone or something in a way that shows a lack of respect
Example
It is unfair to disparage people for their opinions.
C1 adjective /dɪˈmɛntɪd/

demented

Meaning
behaving irrationally due to mental illness or extreme excitement
Example
He looked demented after hearing the shocking news.
C1 verb /daɪˈvɛst/

divest

Meaning
to strip away possessions, rights, or assets; to rid oneself of
Example
The company decided to divest its unprofitable division.
C1 noun /ˈdɒktrɪn/

doctrine

Meaning
A set of beliefs or principles held and taught by a religious, political, or other group.
Example
The church follows a strict doctrine on moral values.
C1 verb /diːˈhaɪdreɪt/

dehydrate

Meaning
to remove water from something; to lose water or body fluids
Example
Running in the heat can quickly dehydrate you.
C1 noun /ˌdɪspɛnˈseɪʃən/

dispensation

Meaning
An exemption from a rule or usual requirement; a system of order, government, or control.
Example
The school granted him a special dispensation to skip the exam due to illness.
C1 noun /dɜːrθ/

dearth

Meaning
A scarcity or lack of something.
Example
There was a dearth of food during the famine.
C1 adjective /ˈdɛkədənt/

decadent

Meaning
Characterized by or reflecting a state of moral or cultural decline; excessively self-indulgent.
Example
The party was filled with decadent luxury and excess.
C1 noun /diːˈkrɪp.ʃən/

decryption

Meaning
The process of converting encrypted data back into its original form so it can be understood.
Example
Hackers attempted decryption of classified data.
C1 verb /ˈduːdəl/

doodle

Meaning
To draw or scribble absentmindedly, often while thinking about something else.
Example
She doodled flowers in the corner of her notebook during class.
C1 adjective /dɪˈstrɔːt/

distraught

Meaning
extremely upset and anxious, often to the point of being unable to think clearly
Example
She was distraught after losing her pet.
C1 verb /dɪˈtɛst/

detest

Meaning
To dislike intensely or hate.
Example
I detest waking up early on weekends.
C1 noun ˌdiː.sen.trə.laɪˈzeɪ.ʃən

decentralization

Meaning
The transfer of authority from central to local government.
Example
Decentralization promotes regional autonomy.