The primary offensive leader in American football who receives the snap from the center and is responsible for passing, handing off, or running with the ball. Often considered the field general who directs the team's offensive strategy.
'Quarter' refers to the position being one-quarter of the way back from the line of scrimmage in early football formations, while 'back' indicates a backfield position. The term emerged in the late 1800s as American football developed distinct positional roles.
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