Definition of blue noun from the Oxford Advanced American Dictionary

 

blue

 noun
noun
NAmE//blu//
 
[countable, uncountable]
 
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  • the color of a clear sky or the ocean on a clear day bright/dark/light/pale blue The room was decorated in vibrant blues and yellows. She was dressed in blue. see also blues
  • Idioms
    a bolt from the blue
     
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    an event or a piece of news that is sudden and unexpected; a complete surprise Her dismissal came as a bolt from the blue.
    the boys in blue(informal)
     
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    the police
    out of the blue
     
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    unexpectedly; without warning The decision came out of the blue.
    See the Oxford Advanced Learner's Dictionary entry: blue