1. The washing machine is playing up again.
洗衣机又出故障了。
2. He was playing up in class today.
他今天在课堂上表现得很调皮。
3. My old knee is playing up.
我的旧伤膝盖又出问题了。

A: Why is the printer making such a weird noise?
A：为什么打印机发出这么奇怪的声音？

B: I think it's playing up due to the paper jam.
B：我想是因为卡纸导致它出故障了。

1) 机器、系统或设备运行不正常或发生故障

2) 孩子或动物行为不端、调皮捣蛋

3) 身体部位（如关节）感到疼痛或不适

1. 机器、系统等发生故障

e.g. The computer is playing up.
电脑出故障了。

2. 行为不端、调皮捣蛋

e.g. The toddler started to play up.
那个蹒跚学步的孩子开始捣乱了。

phrasal verb

1. To malfunction or behave incorrectly (of a machine or system).

2. To behave badly or cause trouble (of a child or animal).

Synonym: malfunction, misbehave