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Noun crack up has 1 sense
  1. breakdown, crack-up - a mental or physical breakdown
    --1 is a kind of collapse
    --1 has particulars: nervous breakdown
    Derived form: verb crack up1
,Verb crack up has 3 senses
  1. crack up, crack, crock up, break up, collapse - suffer a nervous breakdown
    --1 is one way to suffer, sustain, have, get
    Derived form: noun crack-up1
    Sample sentence:
    Somebody ----s
  2. crack up - rhapsodize about
    --2 is one way to     laud, extol, exalt, glorify, proclaim
    Sample sentences:
    Somebody ----s something
    Somebody ----s somebody
  3. break up, crack up - laugh unrestrainedly
    --3 is one way to laugh, express joy, express mirth
    Sample sentence:
    Somebody ----s
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