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English definition of “light up something”

light up something

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

(MAKE BRIGHT)

to make something bright or shiny: When I’d say there was a letter for him you could see his eyes light up.

(MAKE BURN)

to start something burning
(Definition of light up something from the Cambridge Academic Content Dictionary © Cambridge University Press)
What is the pronunciation of light up something?
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