Pronunciation: (kwôr'tur-bak"),[key] —n. 1. a back in football who usually lines up immediately behind the center and directs the offense of the team.
2. the position played by this back.
3. a person who leads or directs a group or activity.
—v.t. 1. to direct the offense of (a team).
2. to lead or direct: to quarterback a public-relations campaign.