The story
- Old French · derived fromdesalöer
- Anglo-Norman · derived fromdesalouer
- Middle English · inherited fromdisallowen
- English todaydisallow
From Middle English disallowen, desallowen, a borrowing from Anglo-Norman desalouer, Old French desalöer. By surface analysis, dis- + allow.
Etymology from Wiktionary, CC BY-SA 4.0.