True-blue meaning

tro͝o'blo͝o'
Authentic, undoubtedly true; honest.
  • (UK) Aristocratic by birth.
  • (Australia, informal) Authentically Australian.
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(historical) A blue dye from Coventry, England, famous for not washing out.
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Loyal or faithful; staunch.
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Very loyal; staunch.
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Alternative spelling of true blue.
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Used other than as an idiom: see true,‎ blue.
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Steadfastly loyal or faithful, unwavering in loyalty.

He was a true blue supporter, and would not listen to what he supposed to be the lies of the opposition.

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Origin of true-blue

  • From the adoption of the color blue by 17th-century Scottish Presbyterians in opposition to the Royalists' red
    From American Heritage Dictionary of the English Language, 5th Edition
  • Refers to a symbolism of colour, dating to mediaeval times, in which blue represents loyalty, constancy, faithfulness and truth.
    From Wiktionary