What does crack up mean?

Looking for the meaning or definition of the word crack up? Here's what it means.

Verb (idiomatic, intransitive) To laugh heartily. (idiomatic, transitive) To cause to laugh heartily. (intransitive, idiomatic) To become insane; to suffer a mental breakdown. (transitive, informal, now usually passive) To cry up; to extol. Find more words! 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He heard the whole class, with the exception of her friends, crack up laughing. He also opened the Mephisto crack up on Paretone, 600m of VIb in a remote and wild face. To economise energy in case of intense heat, the classical air-conditioners can crack up because of excessive expenses on the spool of the capacitor. Each member of the family takes a turn as the centre of attention and tries to make someone else crack up. His stylish arthouse flick looks at three women as they crack up. See Also What is another word for crack up? What is the opposite of crack up? Sentences with the word crack up Words that rhyme with crack up What is the past tense of crack up? Nearby Definitions crackup cracktros cracktro crack trains crack train crack through crackups crack willow crack willows crack wise cracky cracky wagon