quarterbacking is quarterback's Present Participle

quarterback

US [ˈkwɔrtərˌbæk]
UK [ˈkwɔː(r)tə(r)ˌbæk]
  • n.【橄】四分卫;进攻时指挥本队的选手
  • Web四分卫法
Plural Form:quarterbacks  Present Participle:quarterbacking  Past Tense:quarterbacked  
n.
1.
【橄】四分卫;进攻时指挥本队的选手