Webster's English Dictionary

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mischief

mis.chief \'mis(h)-ch*f\ n [ME meschief, fr. OF, calamity, fr. mes- + chief 
   head, end m more at CHIEF 1: injury or damage caused by a human agency  2: 
   a cause or source of harm, evil, or irritation; esp : a person w ho causes 
   mischief 3a: action that annoys or irritates  3b: MISCHIEVOUSNESS