disallow /ˌdɪsəˈlaʊ/ verb3 •To refuse to allow.The prisoners were disallowed to contact with a lawyer. •To reject as invalid, untrue, or improper.The goal was disallowed because the player was offside. •(UK, historical) To overrule a colonial legislation by the sovereign-in-privy council. formsdisallowed · disallowing · disalloweth · disallows · disallowest