noun
dunghill; manure pile
Specifically a pile or heap of horse manure. A somewhat rustic or agricultural term.
昔の農家では、馬糞塚を堆肥として使っていた。
In old farmhouses, they used dunghills as compost.
Compound of 馬糞 (horse dung) and 塚 (mound, pile). The exact historical derivation is uncertain, but the word transparently describes a mound of horse manure.