crack (sb) up Meaning in the Cambridge English Dictionary
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Meaning of “crack (sb) up” in the English Dictionary

"crack (sb) up" in British English

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crack (sb) up

informal
phrasal verb with crack uk   us   /kræk/ verb
C2 to ​suddenlylaugh a lot, or to make someone ​suddenlylaugh a lot: I took one ​look at her and ​cracked up. There's something about that guy's ​face that just ​cracks me up.
(Definition of crack (sb) up from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)
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