" To redshirt someone" is sort of a particular phrase that we use in American sports.
“给某人打红衫” 是我们在美国体育界使用的一个特殊短语。
2012 English Cafe
That " redshirt" year doesn't count towards the seasons of eligibility, meaning it isn't included in that four-year total.
“红衫军” 那一年不计入资格赛季,这意味着它不包括在这四年的总数中。
迷人历史
Garibaldi’s revolutionary soldiers, the iconic redshirts, would invade Sicily with only a thousand men before marching north to unite the peninsula.
加里波第的革命士兵, 即标志性的红衫军,在向北进军统一半岛之前, 仅用一千人入侵西西里岛。
2013 ESLPod
" To redshirt" someone means to take a player, usually a young player, in grade school or high school, and not play them for one year even though they could play.