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Definition: rhoi (contract, gorchymyn llys, etc) o'r neilltu a’i drin fel pe na bai erioed wedi bodoli.
Context: Nid yw hyn yn effeithio ar y posibilrwydd y gall contract gael ei ddad-wneud gan y landlord neu gan ddeiliad y contract (er enghraifft, oherwydd camliwiad twyllodrus gan y landlord),
