知らぬは亭主ばかりなり
Idiom- 1the husband is always the last to know ; everyone knows of the wife's infidelity but the cuckolded husband Translated by Jiyomi
Other writings and readings
知らぬは亭主許り也
expressions (phrases, clauses, etc.)
Kanji · tap to open
JMdict entry 2418970. Source and licence.