In American football, the quarterback is in charge of the team's offense. When football players huddle in a circle to plan their plays, the quarterback usually decides which strategy to use.
In many ways, a quarterback is a team's leader, although ultimately the coach is in charge. When an NFL team wins the Super Bowl, the quarterback accepts the winning trophy. As a verb, to quarterback either means, literally, to play the position of quarterback, or to lead a team or project: "The teacher asked me to quarterback the class Halloween party." Quarterback comes from the starting field position, between the center and the halfback.