red flag

• Предупредительный знак или индикатор потенциальной проблемы, опасности или нежелательной ситуации. Часто используется метафорически для описания того, что должно вызывать беспокойство или осторожность.

A warning sign or indicator of a potential problem, danger, or undesirable situation. Often used metaphorically to describe something that should cause concern or caution.

1. Warning signB2informal

   A sign or signal that indicates a potential problem, danger, or reason for caution.

   Предупреждающий знак

   • His constant lateness was a red flag for the employer.
   • The sudden drop in sales is a red flag for the company.
   • Ignoring these red flags could lead to serious issues.

2. Symbol of dangerB2formal

   A literal or figurative symbol used to warn of danger or to stop an activity.

   Красный флаг

   • The lifeguard raised a red flag to warn swimmers of strong currents.
   • In racing, a red flag means the race must stop immediately.
   • The government issued a red flag warning for the area due to wildfires.