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Noun: monkey business  'múng-kee'biz-nus
Usage: informal
  1. Mischievous or deceitful behaviour
    "The teacher suspected some monkey business when several students had identical wrong answers"

Type of: devilment, devilry, deviltry [archaic], mischief, mischief-making, mischievousness, roguery, shenanigan

Encyclopedia: Monkey business