Definition (行为)
When children are playing up, they are misbehaving.
（小孩）顽皮不服从，造成麻烦
At school, when the children start to play up, the teacher has to take control.
在学校，当孩子们开始调皮捣蛋时，老师必须控制局面。
If they’re not allowed to go to the party, those kids are sure to play up.
如果不让他们参加派对，那些孩子肯定会闹脾气。
Some children play up especially at home, which drives their parents crazy.
有些孩子特别是在家里调皮捣蛋，这让他们的父母非常头疼。