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Noun decrease has 4 senses
decrease, lessening, drop-off - a change downward; "there was a decrease in his temperature as the fever subsided"; "there was a sharp drop-off in sales"--1 is a kind of change, alteration, modification
 Antonyms:  increase
 --1 has particulars:
decrease, decrement - a process of becoming smaller or shorter--2 is a kind of process
 Antonyms:  increase, increment, growth
 --2 has particulars:
decrease, decrement - the amount by which something decreases--3 is a kind of amount
 Antonyms:  increase, increment
 --3 has particulars: drop, dip, fall, free fall; shrinkage
 
decrease, diminution, reduction, step-down - the act of decreasing or reducing something--4 is a kind of change of magnitude
 Antonyms:  increase, step-up
 --4 has particulars:
 |  | cut; moderation; lowering; cutback; devaluation; devitalization, devitalisation; extenuation, mitigation, palliation; easing, easement, alleviation, relief; de-escalation; minimization, minimisation; depletion; shortening; shrinking; subtraction, deduction; deflation; discount, price reduction, deduction; rollback; weakening; depreciation; contraction; reverse split, reverse stock split, split down; amortization, amortisation; declassification; tax shelter, shelter; tax credit | 
 
Verb decrease has 2 senses
decrease, diminish, lessen, fall - decrease in size, extent, or range; "The amount of homework decreased towards the end of the semester"; "The cabin pressure fell dramatically"; "her weight fall to under a hundred pounds"; "his voice fell to a whisper"--1 is one way to change magnitude
 Antonyms:  increase
 Sample sentence:
 Something ----s
 
decrease, lessen, minify - make smaller; "He decreased his staff"--2 is one way to change, alter, modify
 Antonyms:  increase
 Sample sentences:
 Somebody ----s something
 Something ----s something
 
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