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.
To overrule a colonial legislation by the sovereign-in-privy council.
From Middle English disallowen, desallowen, a borrowing from Anglo-Norman desalouer, Old French desalöer. By surface analysis, dis- + allow.
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