warning sign

English

warning sign (plural warning signs)

A sign that indicates a danger, for example to vehicles on a road or of hazardous chemicals.
(figurative) An indication that someone or something is in danger or at risk
- 1994, Florence Weiner, Mathew H. M. Lee, Harriet Bell, Recovering at Home After a Stroke: A Practical Guide for You and Your Family:
  it is crucial to recognize warning signs of an impending stroke and to get to a hospital quickly for emergency medical intervention.
- 2022 October 31, Robert Reich, “Elon Musk’s Paul Pelosi tweet proves he has no business running Twitter”, in The Guardian‎:
  If Musk’s tweet doesn’t raise bright red warning signs all over the world about his judgment and character, I don’t know what will[.]

sign that indicates a danger

indication of danger or risk

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