\Un*teach"\, v. t. [1st pref. un- + teach.]
1. To cause to forget, or to lose from memory, or to
   disbelieve what has been taught.
         Experience will unteach us.           --Sir T.
                                               Browne.
         One breast laid open were a school Which would
         unteach mankind the lust to shine or rule. --Byron.
2. To cause to be forgotten; as, to unteach what has been
   learned. --Dryden.