monkey business

US /ˈmʌŋ.ki ˈbɪz.nɪs/
UK /ˈmʌŋ.ki ˈbɪz.nɪs/
"monkey business" picture
1.

silly, dishonest, or mischievous behavior

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Stop all that monkey business and get to work!
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The teacher suspected some monkey business was going on during the exam.
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