tailback

[ teyl-bak ]
/ ˈteɪlˌbæk /

noun 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.

Origin of tailback

First recorded in 1935–40; tail1 + back1
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

British Dictionary definitions for tailback

tailback

/ (ˈteɪlˌbæk) /

noun

a queue of traffic stretching back from an obstruction
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012