cartão vermelho
1. A card shown by a referee in sports (especially football/soccer) to indicate that a player has been sent off and must leave the field immediately
The defender received a red card for a dangerous foul.
O defensor recebeu um cartão vermelho por uma falta perigosa.
2. Figuratively, a warning or signal that something is unacceptable or must stop
That behavior is a red card for any serious relationship.
Esse comportamento é um cartão vermelho para qualquer relacionamento sério.
In Brazilian and international football culture, the red card is a highly significant symbol of disciplinary action. It's deeply embedded in sports vocabulary and has become a common metaphor in everyday Portuguese for unacceptable behavior or grounds for immediate dismissal. The term is universally understood across Portuguese-speaking countries and is used identically in both Brazil and Portugal.
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