/ Dictionary / Index D double bar: Meaning and Definition of Find definitions for: dou'ble bar' Pronunciation: [key] — Music. Music. a double vertical line on a staff indicating the conclusion of a piece of music or a subdivision of it. See illus. under. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. double-bank double-barreled Related Content Daily Word Quiz: exemplary Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language