in football, and some other sports, a small, yellow card that is shown to a player by the referee (= the official who is responsible for making certain the rules are followed) as a warning that the player has not obeyed a rule, and that they will be punished if it happens again

He was shown a yellow card for a nasty foul on Vastic.

Gazza earned a second yellow card in the semi-final against Germany in the 1990 World Cup, so would miss the final if England won - they lost.

in football and some other sports, to show a player who has not obeyed a rule a small, yellow card as a punishment and a warning that they will not be able to continue playing if it happens again

Hunt had already been yellow-carded for a similar offence earlier in the game, when he pushed an opponent.

He was judged to have dived in Chelsea's penalty area and was yellow carded. 他被判定在切尔西的禁区内假摔并被出示黄牌。