Red card explanation [red warning card] A small red card used by referees in sports competitions to give yellow cards to athletes, coaches or team leaders who commit serious fouls. If they do it again, they will be shown a red card for further punishment. The explanation of red is like the color of blood: red. Red leaves. Red light. Red dust. Red envelopes. Braised. Bright red. Red mouth and white teeth. Tie your feet with a red rope (originally referring to the fate of men and women in their last lives). Symbol of success or popularity: red man. Red clouds and red horns (? The son (an actor popular with the audience) became popular. Explanation board × wooden or other signs: house number. Street signs. Brand. A plaque. Quote. Certificate: gold medal. Silver medal. Waist tag. Product trademark: brand-name goods. What ancient soldiers used to protect their bodies during the war or when modern police dispersed demonstrators: shields. Shield. Entertainment or *