To remove a stain, taint, or mark of disgrace from someone's reputation or honor.
From dis- (prefix meaning 'reverse') + attaint (from Old French attaint, meaning 'touched' or 'tainted'). Attaint comes from Latin tangere, 'to touch,' and was used in medieval law for legal disgrace.
In medieval times, when someone was 'attainted,' they lost their legal rights and their family was shamed. Disattaint was the rare legal process to restore their honor—it's like a historical version of having your criminal record expunged.
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