To deprive of education; to cause to become uneducated or ignorant; to undo educational progress.
From dis- (opposite/remove) + educate (from Latin educare meaning to lead out). The opposite of educate, meaning to reverse learning or remove knowledge.
Historians use 'diseducate' to describe authoritarian regimes that deliberately suppressed literacy and learning—Nazi book burnings were systematic attempts to diseducate an entire population by destroying knowledge sources.
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