(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.
(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.
(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.
(field hockey) A player in the halfback position, with both offensive and defensive roles.
(field sports) Any of various positions on the field of play between the forwards and the fullbacks.
(rugby) The player who feeds the ball into the scrum, and receives the ball as it emerges from the back of the scrum.
