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Noun crack-up has 1 sense
breakdown, crack-up - a mental or physical breakdown--1 is a kind of collapse
 --1 has particulars: nervous breakdown
 
 
Verb crack-up has 3 senses
crack up, crack, crock up, break up, collapse - suffer a nervous breakdown--1 is one way to suffer, sustain, have, get
 Sample sentence:
 Somebody ----s
 
crack up - rhapsodize about--2 is one way to laud, extol, exalt, glorify, proclaim
 Sample sentences:
 Somebody ----s something
 Somebody ----s somebody
 
break up, crack up - laugh unrestrainedly--3 is one way to laugh, express joy, express mirth
 Sample sentence:
 Somebody ----s
 
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