mischief

Concise Oxford English Dictionary © 2008 Oxford University Press:
mischief /ˈmɪstʃɪf/

▶noun

• 1 playful misbehaviour or troublemaking.

• 2 harm or trouble caused by someone or something.

• 3 Law a wrong or hardship which it is the object of a statute to remove or for which the common law affords a remedy.

– phrases
do someone a mischief Brit. informal injure someone.

– origin ME: from OFr. meschief, from meschever ‘come to an unfortunate end’.