/ Dictionary / Index B backer-up: Meaning and Definition of Find definitions for: back•er-up Pronunciation: (bak'ur up'), [key] — pl. back•ers-up. a supporter; backer; second. a linebacker. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. backer backfall Related Content Daily Word Quiz: opulent Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language