Red flag (idiom)

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A red flag being shown to competitors during the 2007 Canadian Grand Prix Red flag f1.jpg
A red flag being shown to competitors during the 2007 Canadian Grand Prix

A red flag is a metaphor of a sign of some particular problem requiring attention. [1]

See also

References

  1. ↑ "Red Flag". Merriam-Webster. Retrieved October 29, 2016.
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