mischief >> ˈmɪstʃɪf
Definition: [noun] playful misbehaviour, especially on the part of children.
Example: she'll make sure Danny doesn't get into mischief
Definition: [noun] harm or trouble caused by someone or something.
Example: she was bent on making mischief
Definition: [noun] a wrong or hardship that a statute is designed to remove or for which the common law affords a remedy.
Example: the statute was passed to prevent a mischief in respect of which the defendant was already under a duty at common law