[{"Bold_text": "noun", "List Items": ["a back football who usually lines up immediately behind the center and directs the offense of the team.", "the position played by this back .", "a person who leads or directs a group or activity."]}, {"Bold_text": "verb (used with object)", "List Items": ["to direct the offense of (a team).", "to lead or direct:to quarterback a public-relations campaign."]}, {"Bold_text": "verb (used without object)", "List Items": ["to play the position of quarterback."]}]