to make someone's face or eyes show pleasure or excitement:
Suddenly a smile lit up her face.
A mischievous gleam lit up her eyes.
4informalto light a cigarette:
I watched Paul light up again.
WORD FOCUS: burn WORD FOCUS: burn to be burning:be on fire, be ablaze, be alight to start burning:catch fire, burst into flames, ignite to make something start burning:light, set fire to something to make something stop burning:put out, extinguish to hurt or damage your skin with hot liquid or steam:scald the crime of deliberately setting fire to buildings:arson ➔ See alsoburn
Definition from the Longman Dictionary of Contemporary English Advanced Learner's Dictionary.