/ Dictionary / Index T tailback: Meaning and Definition of Find definitions for: tail•back Pronunciation: (tāl'bak"), [key] — n. Football. the offensive back who lines up farthest behind the line of scrimmage, as in a single wingback or double wingback formation. the position played by this back. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: tailback (Thesaurus) tail tailband Related Content Daily Word Quiz: immense Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language