From The Collaborative International Dictionary of English v.0.48:

Unteach \Un*teach"\, v. t. [1st pref. un- + teach.]
   [1913 Webster]
   1. To cause to forget, or to lose from memory, or to
      disbelieve what has been taught.
      [1913 Webster]

            Experience will unteach us.           --Sir T.
      [1913 Webster]

            One breast laid open were a school
            Which would unteach mankind the lust to shine or
            rule.                                 --Byron.
      [1913 Webster]

   2. To cause to be forgotten; as, to unteach what has been
      learned. --Dryden.
      [1913 Webster]
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