To make a person a felon or to charge someone with a felony crime (archaic legal term).
From en- + felon (from Old French felon meaning 'wicked' or 'criminal'). Used in medieval legal contexts to describe the process of convicting or declaring someone a criminal.
In old English law, 'to enfelon' someone was a judicial act—it's a reminder that verbs with en- don't just describe physical changes but can also describe legal or social transformations, turning a person's status itself.
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