light up - definition in the Learner's Dictionary - Cambridge Dictionaries Online (US)

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English definition of “light up”

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light up

phrasal verb with light
 
 
/laɪt/ verb ( past tense and past participle lit, lighted)
If your face or your eyes light up, you suddenly look happy or excited: His eyes lit up when you mentioned her name.Feeling pleasure and happinessTaking pleasure in something
(Definition of light up from the Cambridge Learners Dictionary © Cambridge University Press)
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