unteach

Verb
  1. Cause to disbelieve;
    Teach someone the contrary of what he or she had learned earlier (synset 200832009)
    is a type of: instruct, learn, teach - impart skills or knowledge to
  2. Cause to unlearn (synset 200832159)
    "teach somebody to unlearn old habits or methods"
    causes: unlearn - discard something previously learnt, like an old habit
    is a type of: instruct, learn, teach - impart skills or knowledge to

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