Meaning trap
play up
(of children) behave badly
If children play up, they behave badly, often to get attention (mainly British).
phrasal verbB2common
Don't mix these meanings
Same phrase, different job.
(of children) behave badly
If children play up, they behave badly, often to get attention (mainly British).
Hear it in context
Notice where the phrase sounds natural.
The kids always play up when they're tired.
In my experience, children often play up when they feel they're not getting enough attention.
Fix the pattern
One small grammar move makes it sound right.
Not: My son played up very bad at the party.
Say: My son played up at the party.
'Play up' already means 'behave badly' — you don't need 'bad' after it.