misbehave

From Middle English misbehaven, equivalent to mis- +‎ behave.

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  Rhymes: -eɪv

misbehave (third-person singular simple present misbehaves, present participle misbehaving, simple past and past participle misbehaved)

1. (intransitive or reflexive) To act or behave in an inappropriate, improper, incorrect, or unexpected manner.

   He doesn't mean to misbehave; he just doesn't know better.

• go it, carry on, err

• misbehavior, misbehaviour