monkey business

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monkey business (uncountable)

  1. (US, slang) Wasting time, or effort, on some foolish project.
  2. An activity that is considered silly, or stupid, or time-wasting.
  3. (idiomatic) An activity that may be considered illegal, questionable, or a vice, but not felonious.
    • Do your homework and forget about all this monkey business.

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