the.com/red card

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means A referee's signal — a raised red rectangle of cardboard — that ejects a player from a soccer match for serious foul play, leaving their team to finish the game a man short.

from Introduced to football in the early 1970s by English referee Ken Aston, who reportedly dreamed up the color-coded card system while stopped at a traffic light — red for stop, yellow for caution. The cards debuted at the 1970 World Cup, solving the old problem of players (and crowds) not understanding verbal warnings across language barriers.

origin
Introduced at the 1970 World Cup for clarity
why red
Chosen to avoid language barriers between referees and players
consequence
Player ejected, team plays shorthanded rest of match
escalation
Two yellows in one game equal an automatic red
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