Definition of "blue"
adjective:
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Having a bluish colour shade.
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Depressed, melancholic, sad.
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Pornographic or profane.
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Supportive of, run by, pertaining to, or dominated by a political party represented by the colour blue. (e.g. The Conservatives, the Democrats).
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Of the higher-frequency region of the part of the electromagnetic spectrum which is relevant in the specific observation.
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Extra rare; left very raw and cold.
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Possessing a coat of fur that is a shade of gray.
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noun:
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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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Blue clothing.
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The sky, literally or figuratively.
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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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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 Polyommatinae in the family Lycaenidae.
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A bluefish.
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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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A type of firecracker.
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verb:
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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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To spend (money) extravagantly; to blow.
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