Act up
/ækt/B1
PreIntermediate
1. To behave in a disruptive or troublesome way.
- The children started to act up during the long car ride.
- Whenever he's tired, he tends to act up and cause trouble.
2. To malfunction or operate incorrectly.
- My computer is acting up again, I might need a technician.
- The car's engine started to act up after the long drive.
Synonyms:
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