- To misbehave is to behave badly.
When a child throws a temper tantrum in the store even though he knows he is not supposed to do that, this is an example of when the child misbehaves.
verbmis·be·haved, mis·be·hav·ing, mis·be·haves
(third-person singular simple present misbehaves, present participle misbehaving, simple past and past participle misbehaved)
mis- +"Ž behave