Red flag (idiom)

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A red flag could either be a literal red flag used for signaling or, as a metaphor, a sign of some particular problem requiring attention.^[1]

Background

The term and the expression "to raise the red flag" come from various usages of real

indicates that a race has been stopped.

A signal of

make use of such "red flags".

See also

• Red flag (racing)
• Red Flags Rule

References