Definition of red flag noun from the Oxford Advanced Learner's Dictionary


    red flag

    BrE BrE//ˌred ˈflæɡ//
    ; NAmE NAmE//ˌred ˈflæɡ//
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  1. 1a flag used to warn people of danger You mustn’t swim when the red flag is flying.
  2. 2a red flag as a symbol of revolution or communism
See the Oxford Advanced American Dictionary entry: red flag