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English definition of “crack (sb) up”

crack (sb) up

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