Definitions
1.NounAn offensive back whose primary job is to pass the ball in a play.
2.NounAn offensive back who receives the snap (hike) and then blocks the defense from crossing the line of scrimmage; a blocking back.
3.NounA position just behind the forwards, or one who plays this position.
4.VerbTo play the position of quarterback.
5.VerbTo lead a team or group; to be primarily responsible for some group project or activity.