Here's an idiom for you to try out this week in your daily speaking practice!
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This phrase can also be 'to act up' and means the same;
1. For people it means misbehaving
2. For objects it means not working as it should
Let’s have a look at some examples:
She told the class off for playing up during the examination.
My alarm clock was playing up this morning so I was late for work.
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