Definition of “monkey business” - English Dictionary

british dictionary

(Definition of “monkey business” from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

“monkey business” in American English

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monkey businessnoun [ U ]

us /ˈmʌŋ·ki ˌbɪz·nəs/

dishonest or illegal behavior:

There’s been some monkey business connected with his tax returns.

(Definition of “monkey business” from the Cambridge Academic Content Dictionary © Cambridge University Press)