verb (used with object)
to forget or lose knowledge of.
to discard or put aside certain knowledge as being false or binding: to unlearn preconceptions.
verb (used without object)
to lose or discard knowledge.

1400–50; late Middle English unlernen. See un-2, learn

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World English Dictionary
unlearn (ʌnˈlɜːn)
vb , -learns, -learning, -learned, -learnt
to try to forget (something learnt) or to discard (accumulated knowledge)

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Example sentences
It seems he cannot unlearn his less-educated ideas as to how science works or what it is for.
To work here, he's had to learn new techniques and unlearn some others to fit in.
We need urgently to help them unlearn what they're learning through the violence they see.
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