źle się zachowywać

As a result, he said, the two youngest have had a difficult time in school and often act up at home.

"Kids here and everywhere in the world will act up."

Most of the teachers who acted up were in fact men.

I was just going to leave when he began acting up.

She got no cause to act up with a stranger.

Too many crashes and your car will start to act up.

Since the kids are gone, they can't act up in school.

I didn't know what had caused them to act up.

There was much more to this job than acting up in front of the student body.

But for a week the television had been acting up.