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What is "crack up"

Wiktionary
crack up

vb. 1 (context idiomatic intransitive English) To laugh heartily. 2 (context idiomatic transitive English) To cause to laugh heartily 3 (context intransitive idiomatic English) To become insane; to suffer a mental breakdown. 4 (context transitive slang archaic English) To cry up; to extol.

WordNet
crack up

  1. v. suffer a nervous breakdown [syn: crack, crock up, break up, collapse]

  2. rhapsodize about

  3. laugh unrestrainedly [syn: break up]

Usage examples of "crack up".

Cynthia, who had a little brother herself and knows exactly what pretty Ellie has to put up with, wants to crack up but manages to keep a straight face.