Definition of unlearn verb from the Oxford Advanced American Dictionary

 

unlearn

 verb
verb
NAmE//ʌnˈlərn//
 
unlearn somethingVerb Forms present simple I / you / we / they unlearn
 
he / she / it unlearns
 
past simple unlearned
 
-ing form unlearning
 
 
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to deliberately forget something that you have learned, especially something bad or wrong You'll have to unlearn all the bad habits you picked up with your last piano teacher.
See the Oxford Advanced Learner's Dictionary entry: unlearn