red line

• Limite ou fronteira simbólica que não deve ser ultrapassada, usada em contextos políticos, empresariais ou pessoais para indicar uma ação ou condição inaceitável.

A figurative boundary or limit that should not be crossed, often used in political, business, or personal contexts to indicate an unacceptable action or condition.

1. Boundary or limitB2formal

   A figurative limit or threshold that should not be crossed, often in politics, negotiations, or personal relationships.

   linha vermelha

   • The government drew a red line on nuclear weapons development.
   • Crossing that red line would lead to serious consequences.
   • In negotiations, each side has its own red lines.

2. Safety limitB2informal

   A point beyond which a situation becomes dangerous or unacceptable.

   Linha vermelha

   • He knew he had crossed a red line with his rude comments.
   • The company set a red line for employee safety standards.
   • The red line in this debate is respect for human rights.