下しも肥ごえ

noun

manure; night soil

Refers to human excrement used as fertilizer, a traditional practice in agriculture. The term is now largely historical or used in discussions of pre-modern farming.

• 江え戸ど時じ代だいには、下しも肥ごえが貴き重ちょうな肥ひ料りょうとして使つかわれていた。

  During the Edo period, night soil was used as a valuable fertilizer.