1. Blue color or pigment;
    Resembling the color of the clear sky in the daytime (synset 104976072)
    "he had eyes of bright blue"
  2. Blue clothing (synset 102859205)
    "she was wearing blue"
  3. Any organization or party whose uniforms or badges are blue (synset 108497858)
    "the Union army was a vast blue"
  4. The sky as viewed during daylight (synset 109247473)
    "he shot an arrow into the blue"
  5. Used to whiten laundry or hair or give it a bluish tinge (synset 115011152)
  6. The sodium salt of amobarbital that is used as a barbiturate;
    Used as a sedative and a hypnotic (synset 102706551)
  7. Any of numerous small butterflies of the family Lycaenidae (synset 102284909)
  1. Of the color intermediate between green and violet;
    Having a color similar to that of a clear unclouded sky (synset 300371931)
    "October's bright blue weather"; "a blue flame"; "blue haze of tobacco smoke"
  2. Used to signify the Union forces in the American Civil War (who wore blue uniforms) (synset 301610640)
    "a ragged blue line"
  3. Filled with melancholy and despondency (synset 300707060)
    "gloomy at the thought of what he had to face"; "gloomy predictions"; "a gloomy silence"; "took a grim view of the economy"; "the darkening mood"; "lonely and blue in a strange city"; "depressed by the loss of his job"; "a dispirited and resigned expression on her face"; "downcast after his defeat"; "feeling discouraged and downhearted"
  4. Characterized by profanity or cursing (synset 300426521)
    "foul-mouthed and blasphemous"; "blue language"; "profane words"
  5. Suggestive of sexual impropriety (synset 302139604)
    "a blue movie"; "blue jokes"; "he skips asterisks and gives you the gamy details"; "a juicy scandal"; "a naughty wink"; "naughty words"; "racy anecdotes"; "a risque story"; "spicy gossip"
  6. Belonging to or characteristic of the nobility or aristocracy (synset 301594891)
    "an aristocratic family"; "aristocratic Bostonians"; "aristocratic government"; "a blue family"; "blue blood"; "the blue-blooded aristocracy"; "of gentle blood"; "patrician landholders of the American South"; "aristocratic bearing"; "aristocratic features"; "patrician tastes"
  7. Morally rigorous and strict (synset 301303318)
    "puritanic distaste for alcohol"; "she was anything but puritanical in her behavior"; "blue laws"
  8. Causing dejection (synset 300365961)
    "a blue day"; "the dark days of the war"; "a week of rainy depressing weather"; "a disconsolate winter landscape"; "the first dismal dispiriting days of November"; "a dark gloomy day"; "grim rainy weather"
  1. Turn blue (synset 200522721)

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