redshirt
noun /ˈredʃɜːt/
  /ˈredʃɜːrt/
(North American English)- a college sports player who does not play for one year in order to be allowed to play for an extra year later红衫军:大学体育运动员,一年不参加比赛,以便一年后再玩 - He sat out last season as a redshirt.他上个赛季没有穿红衫。 
 
- He sat out last season as a redshirt.