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Từ điển Oxford Advanced Learner 8th
decrease



de·crease [decrease decreases decreased decreasing] verb, noun
verb BrE [dɪˈkriːs] ; NAmE [dɪˈkriːs] intransitive, transitive (rather formal)
to become or make sth become smaller in size, number, etc
~ (from sth) (to sth) The number of new students decreased from 210 to 160 this year.
a decreasing population
Donations have decreased significantly over the past few years.
~ by sth The price of wheat has decreased by 5%.
~ in sth This species of bird is decreasing in numbers every year.
~ sth People should decrease the amount of fat they eat.
Opp: increase
Verb forms:

Word Origin:
late Middle English: from Old French decreis (noun), decreistre (verb), based on Latin decrescere, from de- ‘down’ + crescere ‘grow’.

Thesaurus:
decrease verb
1. I (formal)
The number of students has decreased this year.
fall • • drop • • decline • • come down • • diminish • |especially business sink • • slump • • plunge • • plummet • • tumble
Opp: increase
decrease/fall/drop/decline/come down/diminish/sink/slump/plunge/plummet/tumble by 100, 25%, a half, etc.
decrease/fall/drop/decline/come down/diminish/sink/sink/slump/plunge/plummet/tumble from 1 500 to 1 000
decrease/decline/diminish with age, time, experience, etc.
prices decrease/fall/drop/decline/come down/sink/slump/plunge/plummet/tumble
decrease/fall/drop/decline/slump/plunge dramatically
2. T (formal)
People should decrease the amount of sugar in their diets.
reduce • • cut • • lower • • bring sth down • • cut sth back/cut back on sth • • cut sth down/cut down on sth • • minimize • • turn sth down • |especially AmE business scale sth back • |journalism slash
Opp: increase
decrease/reduce/cut/lower/bring down/cut back/cut down/scale back sth from 100 to 75
decrease/reduce/cut/lower/bring down/cut back/cut down/scale back sth by half, 50, etc.
decrease/reduce/cut/lower/bring down/minimize the risk/rate of sth
Decrease or reduce? Decrease is more formal and less frequent than its opposite, increase; it is used especially in the contexts of health and medicine. The more usual opposite of increase is reduce.

Example Bank:
Average family size has decreased from five to three children.
Crime has decreased by 20 per cent.
Spending has decreased slightly this year.
The heart gradually decreases in size.
The number of quarrels among children decreases with age.
The dose was gradually decreased after eight weeks.

 
noun BrE [ˈdiːkriːs] ; NAmE [ˈdiːkriːs] countable, uncountable
the process of reducing sth or the amount that sth is reduced by
Syn: reduction
~ (in sth) There has been some decrease in military spending this year.
~ (of sth) a decrease of nearly 6% in the number of visitors to the museum
Opp: increase

Word Origin:
late Middle English: from Old French decreis (noun), decreistre (verb), based on Latin decrescere, from de- ‘down’ + crescere ‘grow’.

Thesaurus:
decrease noun C, U
There has been a decrease of 6% in visitor numbers.
reduction • • fall • • drop • • decline • • downturn • • slump • • cut • • cutback
Opp: increase
a decrease/reduction/fall/drop/decline/downturn/slump/cut/cutback in sth
a 20% decrease/reduction/fall/drop/decline/cut
a decrease/reduction/fall/drop/decline/cut/cutback of 20%
see a decrease/reduction/fall/drop/decline/downturn
Which word? Decrease looks like the most direct opposite of increase, but it is not nearly as frequent. For deliberate reductions use reduction or cut. For reductions that happen, fall or drop are often preferred, especially in business contexts.

Example Bank:
Half the companies in the survey reported a decrease in sales.
It is not uncommon to experience a decrease in confidence after a divorce.
Marriage is still on the decrease.
The new treatment led to a huge decrease in the number of deaths.
There has been a sharp decrease in pollution since the law was introduced.
This year's figures show a decrease of 30% on last year.
a decrease from 62% to just under half
There has been a decrease of nearly 6% in the number of visitors to the museum.

 

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