light up Meaning, Definition & Usage

1. verb start to burn with a bright flame
   
   • The coal in the BBQ grill finally lit up
2. verb make lighter or brighter
   light; illuminate; illumine; illume.
   
   • This lamp lightens the room a bit
3. verb become clear
   clear up; clear; brighten.
   
   • The sky cleared after the storm
4. verb ignite
   
   • The sky lit up quickly above the raging volcano
5. verb begin to smoke
   light; fire up.
   
   • After the meal, some of the diners lit up

WordNet