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English definition of “crack (sb) up”

crack (sb) up

verb uk phrasal verb with crack   /kræk/ us  
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 Learners Dictionary & Thesaurus © Cambridge University Press)
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