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English definition of “cut up”

cut up

US phrasal verb with cut     /kʌt/ verb (present participle cutting, past tense and past participle cut)
to behave in a very active and silly way in order to make people laugh: I hate it when Jane cuts up in class.Behaving in a silly way
(Definition of cut up from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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