defensive back
US /dɪˈfensɪv bæk/
UK /dɪˈfensɪv bæk/
1.
防守后卫, 防守型后卫
a player in American or Canadian football whose main role is to prevent the opposing team from completing passes or making long runs
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The defensive back intercepted the pass, turning the tide of the game.
防守后卫截断了传球，扭转了比赛的局势。
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Good coverage by the defensive backs is crucial for a strong defense.
防守后卫的良好覆盖对于强大的防守至关重要。