Definitions
1.verbTo illuminate, to bring light to something, to brighten.
2.verbTo show an increase in activity or a brightening of mood."He saw Mary and his face lit up."
3.verbTo light a cigarette, pipe etc."Smoking in this building is not allowed, so I always step outside to light up."
4.verbTo make happy.
5.verbTo open fire on a target or group of targets.
6.verbTo shock (someone) with a stun gun.