English Phrasal Verb – Act up

 Phrasal Verb

act up


to behave badly


The teacher was really frustrated as the children had been acting up all morning.
The computer’s acting up. I can’t get it to work properly.
If you don’t stop acting up I’ll send you to bed.

Verb and preposition separated? Can’t be separated
Normal or Informal Normal
American / British/ International International
Regular / Irregular Act is a regular verb.