pull a gun

pull a gun on (one)

To draw a gun and threaten one with it. The mugger pulled a gun on me and told me to give him all my money. If you pull a gun on someone, you had better be prepared to use it.
See also: gun, on, pull

pull a gun (on someone)

 and pull a knife (on someone)
to bring out a gun or knife suddenly so that it is ready for use against someone. I screamed when the mugger pulled a knife on me. The police shot the thief when he pulled a gun.
See also: gun, pull