Definition of light up
1 of a light : to become lit : to begin shining All of the lights on the display suddenly lit up. —often used figuratively to express interest or pleasureHis eyes/face lit up when she walked in the room.
2 informal, of a telephone : to show a light indicating that someone is calling When the DJ announced a contest, the phones lit up.
3 informal : to light a cigarette I can't wait to light up after work.
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