act up

[ækt ʌp]

Meaning

  • when someone behaves badly;
  • when a part of your body or a machine doesn’t work as it is needed.

Examples 👇

Little Charlie is acting up again! He has spilt the milk and pretends to be innocent.

I cannot ride the bicycle, because I’m afraid my leg will act up again. I have injured it this month.

If your dog starts to act up as you return, step away. Inside NoVA