misbehave

To behave badly.

To behave (oneself) in an inappropriate way.

To behave ill; conduct one’s self improperly or indecorously.

To conduct (one’s self) ill: with the reflexive pronouns: as, he misbehaved himself.

To behave ill; to conduct one’s self improperly; — often used with a reciprocal pronoun.

to act or behave in an inappropriate, improper, incorrect, or unexpected manner.

behave badly