Breadcrumb Home > Dictionary > Index R running back: Meaning and Definition of Find definitions for: run'ning back" Pronunciation: [key] — Football. Football. an offensive back, as a halfback or fullback, whose principal role is advancing the ball by running with it on plays from scrimmage. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. running running board ✖ Related Content Daily Word Quiz: umbrage Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language