run defendern.American Football a defensive player who aims to stop the offensive team from running the ball; a member of a run defence.
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1955 Waco (Texas) News-Tribune 7 Sept. 11/1 Hugh is a fine pass defender and run defender.
2000 L. Jones in Defensive Football Strategies (Amer. Football Coaches Assoc.) 6/1 Our left corner should be a stronger run defender than the right corner and also a better zone pass defender.