Definition of light up in English:

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light up

(Of a person’s face or eyes) suddenly become animated with liveliness or joy: his eyes lit up and he smiled a smile of delight lit up her face
More example sentences
  • Audrey watched the exchange expectantly, a bright smile suddenly lighting up her entire face.
  • She grinned suddenly, her face lighting up, her eyes turning to tawny amber-green.
  • As for the race itself, Diane breaks into a beaming smile and her eyes light up as she recalls that sunny day at York Racecourse last May.
See parent entry: light
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