If a part of your body or a piece of equipment acts up, it starts to become painful or to develop problems
If children act up, they behave badly
Agree with your partner how you are going to set boundaries for your stepson when he acts up.
I hope my back doesn’t start acting up again.
Indeed, children who are hugely acting up are, in my experience, asking to be assertively managed.
She began to play truant and acted up at home.
Surely none of them could possibly be acting up just for the cameras?
The kids have been acting up again.
Use the camera all the time so the family is used to it and stops going shy or acting up.
There is no origin for this phrasal verb
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