Definition of act up in English:
1(Of a thing) fail to function properly: the plane’s engine was acting up
More example sentences
- The laptop computer that we have been using for performing pulmonary function tests had been acting up lately, overheating and shutting itself off.
- Then again, my body did like to pick the wrong times to start acting up.
- I think the service is messed up here, it was acting up before the phone broke.
malfunction, go wrong, be defective, be faulty
informalbe on the blink, be on the fritz
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