faire des siennes

== French == === Etymology === (This etymology is missing or incomplete. Please add to it, or discuss it at the Etymology scriptorium.) === Pronunciation === IPA(key): /fɛʁ de sjɛn/ === Verb === faire des siennes (informal) to disobey, to get up to mischief, to mess about, to act up, to be up to one's usual tricks, to be up to no good ==== Usage notes ==== Not to be confused with faire sien. ==== See also ==== n'en faire qu'à sa tête