hacking jacket

英 [ˈhækɪŋ dʒækɪt]

美 [ˈhækɪŋ dʒækɪt]

n.  骑马短上装; 赛马服

牛津词典

noun

• 骑马短上装；赛马服
  a short jacket worn for horse riding

柯林斯词典

• 粗呢制骑马外套
  Ahacking jacketis a jacket made of a woollen cloth called tweed. Hacking jackets are often worn by people who go horse riding.