行こう嚢のうこうのうMeanings1nounmailbag; postal sackdated termDated term for a bag used to carry mail; the modern equivalent is 郵袋 (ゆうたい).See also: 郵袋郵ゆう便びん局きょく員いんが行こう嚢のうを担かついで配はい達たつに出でかけた。The postal worker set out on delivery carrying a mailbag.