unteach

[uhn-teech]
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verb (used with object), un·taught, un·teach·ing.

to cause to be forgotten or disbelieved, as by contrary teaching.
to cause to forget or disbelieve something previously taught.

Origin of unteach

First recorded in 1525–35; un-2 + teach
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

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British Dictionary definitions for unteach

unteach

verb -teaches, -teaching or -taught (tr) rare

to cause to disbelieve (teaching)
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012