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English definition of “cut up”

cut up

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