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Verb: crack up
  1. Suffer a nervous breakdown
    - crack, crock up, break up, collapse
     
  2. Rhapsodize about
     
  3. Laugh unrestrainedly
    - break up
Noun: crack-up  'krak,úp
  1. A mental or physical breakdown
    - breakdown

Derived forms: cracks up, cracking up, crack-ups, cracked up

Type of: collapse, exalt, express joy, express mirth, extol, get, glorify, have, laud, laugh, proclaim, prostration, suffer, sustain