Definition of tailback in US English:

tailback

noun

American Football
  • (in some offensive formations) the back who is positioned farthest from the line of scrimmage.

    • ‘Peppers played tailback and defensive end, all the while keeping up with his basketball career.’
    • ‘Ginn will line up at wide receiver, tailback and quarterback and return kicks - all in the name of getting more touches.’
    • ‘On probably 75 percent of its running plays, Ohio State wants to run to the weak side of the offensive line, allowing the tailback to cut back to the strong side.’
    • ‘He has been a tailback, a wide receiver and a part-time quarterback.’
    • ‘On Bush's first touchdown reception, he lined up at tailback, but tight end Dominique Byrd was also in the backfield, creating a dilemma for the defense.’

Pronunciation

tailback

/ˈteɪlbæk//ˈtālbak/