red flag

noun
🔊/ˌred ˈflæɡ/
🔊/ˌred ˈflæɡ/
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  1. a flag used to warn people of danger示警红旗
    • You mustn’t swim when the red flag is flying.红旗飘扬时,您不得游泳。
    Topics Dangerc2
  2. a red flag as a symbol of revolution or communism(象征革命或共产主义的)红旗