Source : WordNet®

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