light up Meaning in Cambridge American English Dictionary
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Meaning of "light up" - American English Dictionary

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light up

phrasal verb with light  us   /lɑɪt/ verb (past tense and past participle lit  /lɪt/ or lighted)

(LOOK HAPPY)

to look happy: Rosa's face lit up when she saw the dog.
(Definition of light up from the Cambridge Academic Content Dictionary © Cambridge University Press)
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