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Noun: crack-up  'krak,úp
Usage: informal
  1. A mental or physical breakdown
    "He suffered a crack-up after months of overwork and stress";
    - breakdown
Verb: crack up
Usage: informal
  1. Laugh unrestrainedly
    "We cracked up at his silly antics";
    - break up
     
  2. Suffer a nervous breakdown
    "The pressure of the job caused him to crack up";
    - crack, break up, collapse

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

Type of: collapse, express joy, express mirth, get, have, laugh, prostration, suffer, sustain