crack up (someone) - definition in the American English Dictionary - Cambridge Dictionaries Online

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English definition of “crack up (someone)”

crack up (someone)

slang
phrasal verb with crack  us   /kræk/ verb
to laugh with great enthusiasm, or to cause someone to laugh in this way: The stories they told cracked me up.
(Definition of crack up (someone) from the Cambridge Academic Content Dictionary © Cambridge University Press)
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