Longman Dictionary of Contemporary English - quarterback

~1 n 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 attacking move 2 Monday morning quarterback AmE someone who gives advice on something only after it has happened ~2 v AmE 1 to play in the position of quarterback in American football 2 informal to organize or direct an activity, event etc  (She quarterbacked the new sales campaign.)