danger line

• Метафорическая граница или порог, за которым ситуация становится небезопасной, рискованной или неприемлемой.

A metaphorical boundary or threshold beyond which a situation becomes unsafe, risky, or unacceptable.

1. Critical thresholdB2formal

   A point or limit beyond which a situation becomes unsafe or risky.

   Критический порог

   • The river's water level has crossed the danger line.
   • His blood pressure is dangerously close to the danger line.
   • The company's debt is approaching the danger line.