The Collaborative International Dictionary
Misbehaving
Misbehave \Mis`be*have"\, v. t. & i. [imp. & p. p. Misbehaved; p. pr. & vb. n. Misbehaving.] To behave ill; to conduct one's self improperly; -- often used with a reciprocal pronoun.
Wiktionary
misbehaving
vb. (present participle of misbehave English)