be up to

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be up to (third-person singular simple present is up to, present participle being up to, simple past was up to, past participle been up to)

1. (idiomatic) To do or be involved in doing; to do (often something mischievous or inappropriate).

   I saw you hiding in the bushes yesterday. What were you up to?

2. (idiomatic) To depend on, to be the choice of.

• get up to
• up to

• “be up to”, in OneLook Dictionary Search.