red flag idiom meaning , origin, examples in a sentence, dark meanings , definition, synonyms, interesting facts, backstory, and the history of the phrase. Learn more about the idiom "raise a red flag ," where it came from, pop culture usage, and how to use it in conversation. RED FLAG definition: 1. a flag used as a sign of danger or to tell someone in a race to stop: 2. a flag used as a…. Learn more. RED FLAG meaning : 1. a flag used as a sign of danger or to tell someone in a race to stop: 2. a flag used as a…. Learn more.

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