Definition of light up in English:
(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.