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Region: General | Usage example: The missing files were a red flag during the audit.

Red flag

Meaning

A warning sign that something is wrong.

Usage

Used to highlight issues needing attention.

Origin & History

Origin notes can vary by region and source; this page gives the commonly reported explanation and usage context.

Used historically to signal danger or caution.

Adopted into general language as a metaphor for warning.

Related Idioms

Raise the flag

Signal readiness or start something officially.

Smell a rat

Suspect that something is wrong.

Caught red handed

Caught in the act, especially while doing something wrong.

More Idioms

Break the ice

To do or say something to relieve tension or get conversation going in a social situation.

Cut to the chase

Skip ahead to the most important or exciting part of something.

The ball is in your court

It is now your turn to take action or make a decision.

Throw in the towel

To concede defeat or admit a struggle isn't worth continuing.