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

blue flag

noun
 
/ˌbluː ˈflæɡ/
 
/ˌbluː ˈflæɡ/
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  1. (British English) a blue flag used in motor racing to show that a driver who is much further ahead is trying to pass
  2. an award given to beaches in Europe that are clean and safe
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