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English definition of “be up to no good”

be up to no good

informal
to be behaving in a dishonest or bad way: He certainly looked as if he was up to no good.DishonestBad and wrong behaviourDisobedientObeying and breaking the lawObedient and compliant
(Definition of be up to no good from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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