Etymology
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quarterback (n.)

also quarter-back, U.S. football position, 1876, from quarter (n.1) + back (n.); so called from his position on the field at the start of play, between the halfback and the center.

As a verb, "to play quarterback," by 1945. The figurative sense (the quarterback when on the field typically directed the team's plays) is from 1952. Monday morning quarterback is by 1932 as a noun, "second-guesser of other people's decisions, one who criticizes or passes judgment afterward on how something was done;" by 1972 as a verb; originally pro football player slang for sportswriters (U.S. professional football games typically were played on Sundays).

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Definitions of quarterback
1
quarterback (n.)
(football) the person who plays quarterback;
Synonyms: signal caller / field general
quarterback (n.)
(American football) the position of the football player in the backfield who directs the offensive play of his team;
quarterback is the most important position on the team
Synonyms: signal caller / field general
2
quarterback (v.)
play the quarterback;
From wordnet.princeton.edu