unlearn - definition and synonyms

verb [transitive] informal 

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/ʌnˈlɜː(r)n/
present tense
I/you/we/theyunlearn
he/she/itunlearns
present participleunlearning
past tenseunlearnt
past participleunlearnt
  1. to change the way that you have learned to think or do things, usually because that way is not good or useful