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Of the colour blue.
example
the deep blue sea
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Depressed, melancholic, sad.
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Pale, without redness or glare; said of a flame.
example
The candle burns blue.
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Supportive of, run by (a member of), pertaining to, or dominated by a political party represented by the colour blue.
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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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(of steak) Extra rare; left very raw and cold.
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(of a dog or cat) Having a coat of fur of a slaty gray shade.
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Severe or overly strict in morals; gloomy.
example
blue and sour religionists; blue laws
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(of women) literary; bluestockinged.
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Having a color charge of blue.
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(entertainment) Risque or obscene
example
His material is too blue for prime-time