linebackerWiktionary 原文中文来自 ECDICTn.中后卫球员构词拆分line词根/词干+backer词根/词干词源说明From line + backer.释义（英文）名词 Noun(American football) The defensive players who are in position behind the defensive linemen and in front of the safeties and cornerbacks and whose principal responsibilities are to tackle runners and to defend against shorter passes.