Definition of halfbacks:
(n) :
(American football) An offensive back whose primary jobs are to carry the ball on running plays and to serve as a receiver or blocker on passing plays.
(n) :
(field sports) A player who occupies one of these positions.
(n) :
(field sports) Any of various positions on the field of play between the forwards and the fullbacks.
(n) :
(field hockey) A player in the halfback position, with both offensive and defensive roles.
(n) :
(Australian rules football) One of three players (the centre halfback and two halfback flankers) on the line between the centre line and the fullback line.
(n) :
(Canadian football) A defensive back whose primary jobs are to cover the slotback on passing plays and prevent running plays from going to the outside.