Bump and run coverage
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Bump and run coverage is a strategy often used by defensive backs in American Football in which a defensive player will line up directly in front of a wide receiver and try to "bump" them with their arms in order to disrupt their intended route. This varies from the more traditional defensive formation in which a defensive player will give the receiver a "cushion" of about 5 yards in order to prevent the receiver from getting behind them. This tactic is possible because of the rule allowing defensive players to initiate contact within five yards of the line of scrimmage.