yellow flag

noun
🔊/ˌjeləʊ ˈflæɡ/
🔊/ˌjeləʊ ˈflæɡ/
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  1. a type of yellow iris (= a flower) that grows near water 黄鸢尾;黄菖蒲
  2. a yellow flag on a ship showing that somebody has or may have an infectious disease (= one that can spread easily) (表示船上有疫情而挂起的)检疫旗,黄旗