misbehave

/M IH0 S B AH0 HH EY1 V/
verb
  1. 1

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

    โ€œHe doesn't mean to misbehave; he just doesn't know better.โ€

Source: https://en.wiktionary.org/wiki/misbehave