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Up to something

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LampPro Tip 1/2
Sneaky ImplicationPlay
Suggests someone might be hiding their true intentions or plans. SlideWhen he tiptoed out, I knew he was up to something.
LampPro Tip 2/2
Negative SlangPlay
Used in casual language, hints the activity might be mischievous or wrong. SlideLook at those kids whispering; they must be up to something.