play up - definition in the Learner's Dictionary - Cambridge Dictionaries Online

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English definition of “play up”

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play up

UK phrasal verb with play
 
 
/pleɪ/ verb
CHILD If a child plays up, he or she behaves badly.Bad and wrong behaviourDisobedientObeying and breaking the lawObedient and compliantChildren and babies
MACHINE If a machine plays up, it does not work as it should.Failing and doing badly
(Definition of play up from the Cambridge Learners Dictionary © Cambridge University Press)
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