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


    yellow flag

    BrE BrE//ˌjeləʊ ˈflæɡ//
    ; NAmE NAmE//ˌjeloʊ ˈflæɡ//
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  1. 1 a type of yellow iris (= a flower) that grows near water
  2. 2a yellow flag on a ship showing that somebody has or may have an infectious disease
See the Oxford Advanced American Dictionary entry: yellow flag