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Definition

Misbehaving, being mischievous.

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In Context

  • "He acts like an angel when his parents get home, but the rest of the time he's up to no good."
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Related Idioms

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up in the air

Not yet resolved, finished, answered, decided or certain.

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up for

Willing to participate in; interested in.

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up to here

Overwhelmed, busy, buried or swamped.

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up to scratch

sufficient; adequate; of acceptable or satisfactory quality

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up to speed

Fully informed; current.

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up the river

To prison.
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