English

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

      

    blue

     noun
    noun
    BrE BrE//bluː//
     
    ; NAmE NAmE//bluː//
     
    see also blues Hair colour
     
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  1. 1  [countable, uncountable] the colour of a clear sky or the sea/ocean on a clear day bright/dark/light/pale blue The room was decorated in vibrant blues and yellows. She was dressed in blue.
  2. 2[countable] (British English) a person who has played a particular sport for Oxford or Cambridge University; a title given to them He’s an Oxford rugby blue. She won a blue for rowing.
  3. 3[countable] (Australian English, New Zealand English, informal) a mistake
  4. 4[countable] (Australian English, New Zealand English, informal) a name for a person with red hair See related entries: Hair colour
  5. 5[countable] (Australian English, New Zealand English, informal) a fight
  6. Word Origin Middle English: from Old French bleu, ultimately of Germanic origin and related to Old English blǣwen ‘blue’ and Old Norse blár ‘dark blue’.Idioms an event or a piece of news which is sudden and unexpected; a complete surprise Her dismissal came as a bolt from the blue. See related entries: Surprise (informal) the police See related entries: The police unexpectedly; without warning The decision came out of the blue.
See the Oxford Advanced American Dictionary entry: blue