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The definition of crack up
5 Definitions of: crack up
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- verb, to break into pieces
- verb, to undergo a physical or mental breakdown
- verb, to present or report, esp in glowing terms
- verb, to laugh or cause to laugh uproariously or uncontrollably
- noun, a physical or mental breakdown
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| Synonyms: | laugh, guffaw, Informal informal informal slang informal informal slang informal slang slang slang collapse, break down, freak out |
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From Collins
©HarperCollins 2008. Collins English Dictionary definition of crack up