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I hope you are not up to any tricks.

What is he up to?

What are the meanings of "up to" in the above two sentences?

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According to Cambridge Dictionary,

to be up to smth: to be doing something, often something bad or illegal, usually secretly.

He looks very suspicious hanging around outside - I'm sure he 's up to something

Thus, in your phrases, it means the person is asking what the other person is doing (implicitly suggesting a bad connotation).

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