misdemean

[ mis-di-meen ]
/ ˌmɪs dɪˈmin /

verb (used with object) Rare.

to misbehave (oneself).

Origin of misdemean

late Middle English word dating back to 1350–1400; see origin at mis-1, demean2

British Dictionary definitions for misdemean

misdemean
/ (ˌmɪsdɪˈmiːn) /

verb

a rare word for misbehave