蚕こ糞くそ

noun

silkworm droppings; silkworm excrement

Refers to the feces of silkworms, often used as fertilizer or in traditional medicine.

• 蚕こ糞くそは昔むかし、肥ひ料りょうとして使つかわれていた。

  Silkworm droppings were used as fertilizer in the past.