light up

(verb) start to burn with a bright flame. Synonyms: light up. Example: "The coal in the bbq grill finally lit up."

(verb) make lighter or brighter. Synonyms: light, illume, illumine, light up, illuminate. Example: "This lamp lightens the room a bit."

(verb) become clear. Synonyms: clear up, clear, light up, brighten. Example: "The sky cleared after the storm."

(verb) ignite. Synonyms: light up. Example: "The sky lit up quickly above the raging volcano."

(verb) begin to smoke. Synonyms: light up, fire up, light. Example: "After the meal, some of the diners lit up."