infantry term to open fire on someone, by order or individually

shooting at someone

killing the enemy with small arms fire
a haji seen running with AK47 light him up!

the MF started shooting at us so we lit him up
by alpino November 06, 2009
in paintball, or any form of gun-based combat, it is a phrase meaning "concentrate fire on that guy", or "shoot him till he screams"
"We got one behind those barrels! Light him up!"
by rob October 03, 2004

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