Up to something
Definition 1 of 4
Pro Tip 1/2Sneaky Implication
Suggests someone might be hiding their true intentions or plans.
When he tiptoed out, I knew he was up to something.
Pro Tip 2/2Negative Slang
Used in casual language, hints the activity might be mischievous or wrong.
Look at those kids whispering; they must be up to something.
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