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Phrasal Verb - Act up

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You probably know the verb to act used for actors acting in a film or in the theatre. When used as a phrasal verb with the preposition up it has a different meaning:

Act up- Misbehave; behave badly or strangely.

'My computer has been acting up recently. I need to get it repaired. It's probably got a virus.'

Link:Phrasal Verb 'See Through'