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Definición de “act up” en inglés

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act up

verb uk phrasal verb with act   /ækt/ us  
If a person, especially a child, acts up, they behave badly: Sophie got bored and started acting up. If a machine or part of the body acts up, it does not perform as well as it should: My car always acts up in cold weather. Her shoulder was acting up (= hurting because of injury).
(Definition of act up from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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