Meaning of light up

Definition of light up

(verb) start to burn with a bright flame; "The coal in the BBQ grill finally lit up"
make lighter or brighter; "This lamp lightens the room a bit"
become clear; "The sky cleared after the storm"
ignite; "The sky lit up quickly above the raging volcano"
begin to smoke; "After the meal, some of the diners lit up"

Other information on light up

WIKIPEDIA results for light up
Amazon results for light up