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

yellow flag

noun
 
/ˌjeləʊ ˈflæɡ/
 
/ˌjeləʊ ˈflæɡ/
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  1. a type of yellow iris (= a flower) that grows near water
  2. a yellow flag on a ship showing that somebody has or may have an infectious disease (= one that can spread easily)
See yellow flag in the Oxford Advanced American Dictionary
Check pronunciation: yellow flag

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adverb
 
 
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