In Canadian football, most commonly the Canadian Football League, the Halfback does not refer to the Runningback, but rather a Defensive back. The defensive halfback lines up inside covering the Slot Receiver. 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 motion of a slot receiver, which is allowed before the snap in the CFL.