a weapon that shoots bullets, for example a pistol or a rifle. You load a gun with ammunition and pull the trigger to use it“Move!” said Cardiff, waving the gun at them.
She found herself looking down the barrel of a gun.
a gang armed with machine guns
aim/point a gun: He pointed the gun directly at me.
fire a gun: She was learning how to fire a gun.
carry a gun: Their police officers all carry guns.
draw a gun (=take it out, ready to use): He spun around at the noise, drawing his gun.
pull a gun on someone (=take out a gun and point it at someone): Suddenly the officer pulled a gun on them.
a gun goes off (=it shoots a bullet): A police gun went off accidentally during a search of his home.
gun battle: He was shot dead in a gun battle with the police.