http://www.firstbasesports.com/football_glossary.html
Astroturf: an artificial surface used instead of grass on many
football fields.
audible: verbal commands shouted by the quarterback to his
teammates at the line of scrimmage to change a play on short
notice.
backfield: the area behind the line of scrimmage.
backs: the running backs; the halfback and the fullback.
ball carrier: any player who has possession of the ball.
beat: when a player gets past an opponent trying to block or
tackle him.
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