Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • transitive v. To cause to forget or unlearn something.
  • transitive v. To teach the opposite or contrary of (something previously taught).

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • v. To cause someone to unlearn; to make someone forget something they have been taught.
  • v. To cause something previously learned to be forgotten.

from the GNU version of the Collaborative International Dictionary of English

  • transitive v. To cause to forget, or to lose from memory, or to disbelieve what has been taught.
  • transitive v. To cause to be forgotten.

from The Century Dictionary and Cyclopedia

  • To cause to forget, disbelieve, or give up what has been taught.
  • To make forgotten; make to cease from being acquired by instruction.

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

  • v. cause to unlearn
  • v. cause to disbelieve; teach someone the contrary of what he or she had learned earlier

Etymologies

un- +‎ teach (Wiktionary)

Examples

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