fullback /ˈfʊlˌbæk/

• 1. 

  N-COUNT In American football, a fullback is a player on the attacking team whose position is behind the quarterback. (美式橄榄球)攻击后卫 [美国英语]

• 2. 

  N-COUNT In football or rugby, a fullback is a defending player whose position is toward the goal which their team is defending. (足球或英式橄榄球)边后卫