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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. Browne. [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]