iouglossary / IOU IOU (I-oh-yoo). [abbr. “I owe you”]1. A memorandum acknowledging a debt.2. The debt itself. — Also termed due-bill. 词条贡献者 资深译员Sheldon,毕业于亚洲顶尖的高级翻译学院,擅长翻译有关零售和消费品领域的法律文件。