Un*teach" (?), v. t. [1st pref. un- + teach.]
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.
To cause to be forgotten; as, to unteach what has been learned.
© Webster 1913.