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English definition of “up to”

up to

preposition (DOING)   
be up to sth B1 informal to be doing something, often something bad or illegal, usually secretly: She's up to no good (= doing something bad or forbidden) - you can always tell because she stays in her room. He looks very suspicious hanging around by the bins - I'm sure he's up to something.Acting and actsDealing with things or people
(Definition of up to preposition (DOING) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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