上うわ臼うす

noun

upper millstone

Refers to the top stone in a traditional stone mill, used for grinding grains. A specialized term encountered in historical or agricultural contexts.

• 石いし臼うすの上うわ臼うすを回まわして大だい豆ずを粉こなにする。

  Turn the upper millstone of the stone mill to grind soybeans into powder.