Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • transitive verb To free from illusion or deception.

from The Century Dictionary.

  • To free from deception, cheat, fallacy, or mistake; open one's eyes.

from the GNU version of the Collaborative International Dictionary of English.

  • transitive verb To cause to be no longer deceived; to free from deception, fraud, fallacy, or mistake.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • verb transitive To free from misconception, deception or error.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • verb free from deception or illusion

Etymologies

from Wiktionary, Creative Commons Attribution/Share-Alike License

un- +‎ deceive

Examples

  • Their avowed object was to present a petition personally to the Prince Regent, that they might "undeceive" him; as if such a thing were possible, or, being possible, would be of the slightest service.

    The Revolution in Tanner's Lane

  • Pray undeceive my Mother with regard to the agreeable mistake as to the repairs —

    Letter 96

  • Mrs. Setliffe saw his mistake, appreciated the naive compliment, and decided not to undeceive him.

    To Kill a Man

  • In his poem "Shiloh" (the first massive battle of the Civil War with almost 24,000 casualties), Herman Melville writes "What like a bullet can undeceive".

    Discourse.net: Unarmed, This Time

  • 'That is indeed unfortunate; but if you are really blameless, cannot you undeceive them?'

    Chapter 15

  • But all that would now change as “the adoption and prosecution of the energetic policy proposed must soon undeceive them.”

    A Country of Vast Designs

  • But all that would now change as “the adoption and prosecution of the energetic policy proposed must soon undeceive them.”

    A Country of Vast Designs

  • "You don't have to speak to the web," Dor said quickly, though he was sorry to undeceive her.

    Falcon Street

  • If they regard it as a luxury for me to have a private secretary, why should I undeceive them?

    The Tyranny of E-mail

  • Camilla again denied the charge, and strove to prevail with her to undeceive the Baronet from any false expectations.

    Camilla

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