red card
noun [ C usually singular ] uk/ˌred ˈkɑːd/ us/ˌred ˈkɑːrd/
(足球比赛中的)红牌
in football, a small, red card that is shown by the referee (= the official who is responsible for making certain that the rules are followed) to a player who has not obeyed a rule and who is therefore not allowed to continue playing