Light-up meaning

To bring light to something, to brighten.
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(intransitive) To become light, to brighten.

He saw Mary and his face lit up.

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(intransitive) To light a cigarette, pipe, etc.

Smoking in this building is not allowed, so I always step outside to light up.

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To make happy.
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(slang) To open fire on a target or group of targets.
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