Synonyms of 'act up'
▷ See act
1 misbehaveDictionary, carry on (informal) , cause trouble
I could hear him acting up downstairs.
When the children misbehaved she was unable to cope.
carry on (informal)
She was yelling and screaming and carrying on like an idiot.
horse around (informal)
piss about (taboo , slang)
piss around (taboo , slang)
give someone grief (British , South Africa)
2 malfunctionDictionary, go wrong, break down
The machine was acting up again.
Radiation can cause microprocessors to malfunction.
If your video recorder goes wrong, you can have it repaired.
Their car broke down.
conk out (informal)
go phut (informal)
pack up (informal)
Our car packed up.
play up (British , informal)
The engine has started playing up.
Copyright © 2016 by HarperCollins Publishers. All rights reserved.
Thesaurus for act up from the Collins English Thesaurus
If something is acting up , it is not working properly.