Unteach

Part of speech: verb (v.)

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.