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English definition of “be up to no good”

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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.
Translations of “be up to no good”
in Chinese (Traditional) 做壞事, 做不光彩的事…
in Chinese (Simplified) 做坏事, 做不光彩的事…
(Definition of be up to no good from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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