To play up is to behave badly — or, of a bad knee or an old car, to give trouble. Two senses about something not cooperating.
The behaviour sense is used about children and is mild, so a class playing up is being difficult rather than dangerous. The trouble sense is very British and oddly affectionate, since saying that a shoulder is playing up again treats the body like a temperamental machine. There is a third sense meaning to emphasise, since playing up an advantage means making the most of it.
Practised in Phrasal Verbs, A Man Called Ove
First appears in chapter 7 of A Man Called Ove.
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