I. quar ‧ ter ‧ back 1 /ˈkwɔːtəbæk $ ˈkwɔːrtər-/ BrE AmE noun [countable]
1 . the player in American football who directs the team’s attacking play and passes the ball to the other players at the start of each attack
2 . Monday morning quarterback American English informal someone who gives advice about something only after it has happened
II. quarterback 2 BrE AmE verb American English
1 . [intransitive] to play in the position of quarterback in American football
2 . [transitive] informal to organize or direct an activity, event etc:
She quarterbacked the new sales campaign.