from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. Used other than as an idiom: see true,‎ blue.
  • adj. Steadfastly loyal or faithful, unwavering in loyalty.
  • adj. Authentic, undoubtedly true; honest.


Refers to a symbolism of colour, dating to mediaeval times, in which blue represents loyalty, constancy, faithfulness and truth. (Wiktionary)


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