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

black flag

noun
 
/ˌblæk ˈflæɡ/
 
/ˌblæk ˈflæɡ/
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  1. a black flag used in motor racing to stop a driver who has done something wrong
  2. a flag with a skull and crossbones on it
See black flag in the Oxford Advanced American Dictionary
previously
adverb
 
 
From the Word list
Oxford 3000
B1
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