red flag definition, meaning - what is red flag in the British English Dictionary & Thesaurus - Cambridge Dictionaries Online

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English definition of “red flag”

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red flag

noun [C] uk   us  
a flag used as a sign of danger: You're not allowed to swim when the red flag is flying. a flag used as a symbol of revolution
(Definition of red flag from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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