Blue meaning

blo͝o
The definition of blue is having the color that looks like a clear day sky or being sad.

An example of blue used as an adjective is the phrase a "blue shirt" which means a shirt that is that color.

An example of blue used as an adjective is the phrase a "blue melody" which means a song that is depressing.

adjective
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Blue is defined as the color between green and indigo in the rainbow that looks like the clear daytime sky.

An example of blue is the color of the Internet Explorer icon.

noun
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The hue of that portion of the visible spectrum lying between green and indigo, evoked in the human observer by radiant energy with wavelengths of approximately 420 to 490 nanometers; any of a group of colors that may vary in lightness and saturation, whose hue is that of a clear daytime sky; one of the additive or light primaries; one of the psychological primary hues.
noun
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Wearing blue.
adjective
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A bluefish.
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(politics) Supportive of, run by (a member of), pertaining to, or dominated by a political party represented by the colour blue.
  • (politics, in particular, in the US) Supportive of, run by (a member of), pertaining to, or dominated by the Democratic Party. [after 2000]
    I live in a blue constituency.
    Congress turned blue in the mid-term elections.
  • (Australia, politics) Supportive of or related to the Liberal Party.
    Illawarra turns blue in Liberal washout.
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(of steak) Extra rare; left very raw and cold.
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(of a dog or cat) Possessing a coat of fur that is a shade of gray.
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(archaic) Severe or overly strict in morals; gloomy.

Blue and sour religionists.

Blue laws.

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(archaic, of women) Literary; bluestockinged.
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The colour of the clear sky or the deep sea, between green and violet in the visible spectrum, and one of the primary additive colours for transmitted light; the colour obtained by subtracting red and green from white light using magenta and cyan filters; or any colour resembling this.

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A blue dye or pigment.
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Any of several processes to protect metal against rust.
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(in the plural) A blue uniform. See blues.
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(slang) A member of law enforcement.
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The sky, literally or figuratively.

The ball came out of the blue and cracked his windshield.

His request for leave came out of the blue.

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The ocean; deep waters.
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Anything blue, especially to distinguish it from similar objects differing only in color.
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(snooker) One of the colour balls used in snooker, with a value of 5 points.
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Any of the blue-winged butterflies of the subfamily Polyommatini in the family Lycaenidae.
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(Australia, colloquial) An argument.
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A liquid with an intense blue colour, added to a laundry wash to prevent yellowing of white clothes.
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(UK) A type of firecracker.
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(archaic) A pedantic woman; a bluestocking.
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(ergative) To make or become blue.
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(metallurgy) To treat the surface of steel so that it is passivated chemically and becomes more resistant to rust.
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(slang) To spend (money) extravagantly; to blow.
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anagrams
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A surname​. An anglicization of German Blau.
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(rare) A female given name, typically used in conjoined names like Bonnie Blue or Blue Bell.
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A male nickname, occasionally used as a formal given name.
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A present or former letterman at Oxford or Cambridge.
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Any of various small blue butterflies of the family Lycaenidae.
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Of the color blue.
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Bluish or having parts that are blue or bluish, as the blue spruce and the blue whale.
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Having a gray or purplish color, as from cold or contusion.
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Being a trail, as for skiing, marked with a sign having a blue square, indicating an intermediate level of difficulty.
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Relating to or being a blue state.
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Puritanical; strict.
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Aristocratic; patrician.
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Indecent; risqué.

A blue joke; a blue movie.

adjective
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To make or become blue.
verb
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Having the color of the clear sky or the deep sea.
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Livid.
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Sad and gloomy; depressed or depressing.
adjective
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Balefully murky.

The air was blue with oaths.

adjective
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Puritanical; rigorous.
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Wearing blue garments.

Blue Nuns.

adjective
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(informal) Indecent; risqué; suggestive.
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(informal) Democratic.
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The color of the clear sky or the deep sea; any color between green and violet in the spectrum.
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Any blue pigment or dye.
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Bluing.
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Anything colored blue, as the third circle of an archer's target.
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noun
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To make or become blue.
verb
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Of the colour blue.

The deep blue sea.

adjective
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(informal) Depressed, melancholic, sad.
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Pale, without redness or glare; said of a flame.

The candle burns blue.

adjective
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(entertainment, informal) Pornographic or profane.

The air was blue with oaths.

A blue movie.

adjective
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(astronomy) Of the higher-frequency region of the part of the electromagnetic spectrum which is relevant in the specific observation.
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Blue clothing.

The boys in blue marched to the pipers.

noun
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blue in the face
  • At the point of extreme exasperation:
    I argued with them until I was blue in the face.
idiom
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into the blue
  • At a far distance; into the unknown:
    Spontaneously take a trip into the blue.
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out of the blue
  • From an unexpected or unforeseen source:
    Criticism that came out of the blue.
  • At a completely unexpected time:
    A long-unseen friend who appeared out of the blue.
idiom
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out of the blue
  • as if from the sky; without being expected or foreseen
idiom
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the blue
  • the sky
  • the sea
idiom
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Idioms and Phrasal Verbs

blue in the face
into the blue
the blue

Origin of blue

  • Middle English blue, bleu from Old French bleu of Germanic origin bhel-1 in Indo-European roots

    From American Heritage Dictionary of the English Language, 5th Edition

  • From Middle English blewe, partially from Old English *blǣw ("blue"; found in derivative blǣwen (“bluish”)); and partially from Anglo-Norman blew, blef (“blue”), from Medieval Latin blāvus, blāvius (“blue”), from Old Frankish *blāw, *blāo (“blue”); both from Proto-Germanic *blēwaz (“blue, dark blue”), from Proto-Indo-European *bʰlēw- (“yellow, blond, grey”). Cognate with English dialectal blow (“blue”), Scots blue, blew (“blue”), North Frisian bla, blö (“blue”), Saterland Frisian blau (“blue”), Dutch blauw (“blue”), German blau (“blue”), Swedish blå (“blue”), Icelandic blár (“blue”), Latin flāvus (“yellow”), Middle Irish blá (“yellow”), Lithuanian blãvas (“blue”). Doublet of blae.

    From Wiktionary