An archaic verb meaning to forbid, deny, or speak against something; to pronounce judgment against.
From Old English 'for-' (completely, against) + 'say' or 'seggan.' The 'for-' prefix intensifies the meaning of 'say' to mean speaking with authority or denial.
In Old English law and literature, to 'forsay' something meant to officially declare it forbidden—it's how authorities made pronouncements stick.
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