/ Dictionary / Index M machine gun: Meaning and Definition of Find definitions for: machine' gun" Pronunciation: [key] a small arm operated by a mechanism, able to deliver a rapid and continuous fire of bullets as long as the trigger is pressed. ma•chine-gun Pronunciation: (mu-shēn'gun"), [key] — -gunned, -gun•ning. to shoot at with a machine gun. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. machine bolt machine language Related Content Daily Word Quiz: philanthropy Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language