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In American football and Canadian football, defensive backs (DBs) are the players on the defensive team who take positions somewhat back from the line of scrimmage; they are distinguished from the defensive line players and linebackers, who take positions directly behind or close to the line of scrimmage. The defensive backs, in turn, generally are classified into several different specialized positions: *Safety: * *Free Safety – most often the deepest safety * *Strong Safety – the bigger more physical safety, much like a small, quicker linebacker *Defensive halfback (Canadian football only) *Cornerback – which include: * *nickel back – the fifth defensive back in some sets, such as the Nickel formation * *dime back – the sixth defensive back in some sets, such as the Dime formation * *The seventh defensive back, in the exceedingly rare 'quarter' set * * *known as a dollar back or a quarter back (not to be confused with the offensive player who throws the ball) The group of defensive backs is known collectively as the secondary. They most often defend the wide receiver corps; however, at times they may also line up against a tight end or a split out running back. == See also == * American football positions 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Defensive back」の詳細全文を読む スポンサード リンク
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