Halfback (Canadian football)
（重定向自Defensive halfback）
The halfback in Canadian football, and most commonly the Canadian Football League, currently refers to the defensive back rather than the running back, as in American football. The defensive halfback lines up inside covering the slotback. They are usually slightly larger than the cornerback to assist the linebackers in stopping the run. They can also be seen backing off the line early, to counter the forward motion of a slotback, which is allowed before the snap in the CFL.