light up

phrasal verb

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 pleasure His 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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a state of commotion or excitement

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