play up
—phrasal verbwithplayverbuk/pleɪ/us/pleɪ/
(CHILD)
UK
Whenchildrenplayup, theybehavebadly.
（孩子）调皮不听话，惹麻烦
Theboyshave beenplayingup atschoolagain.这些男孩子又在学校里调皮捣蛋了。
(MACHINE)
If amachineplaysup, it does notworkas it should.
出故障
Thestartermotorwasplayingup again.启动马达又出故障了。