Definition of light up phrasal verb from the Oxford Advanced Learner's Dictionary

 

light up

 phrasal verb
phrasal verb
 
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Phrasal Verbs

    light up

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    light somethingup

     
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  1. 1(informal) to begin to smoke a cigarette They all lit up as soon as he left the room. He sat back and lit up a cigarette.
  2. 2to become or to make something become bright with light or colour There was an explosion and the whole sky lit up. The night sky was lit up with fireworks.
  3. 3if somebody’s eyes or face light up, or something lights them up, they show happiness or excitement His eyes lit up when she walked into the room. A smile lit up her face.
See the Oxford Advanced American Dictionary entry: light up