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Up to (something)

To be occupied in or planning some activity that is often bad.

I do not know what the boy was up to last night but it was probably something bad.

Related Idioms

Act up

To misbehave. The children began to act up during the field trip. Read more →

Add up

To total up to a certain amount. I will add up the money that I owe to my father and give it to him. Read more →