Jisho

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していしゅ 知らぬは亭主ばかりなり
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Expressions (phrases, clauses, etc.)
1. the husband is always the last to know; everyone knows of the wife's infidelity but the cuckolded husband​Idiomatic expression
Other forms
知らぬは亭主許り也 【しらぬはていしゅばかりなり】

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