小こ返がえり

noun

inclined plane

A simple machine consisting of a sloping surface; used in physics and engineering contexts. The term is relatively rare and technical.

• 小こ返がえりは、斜しゃ面めんを利り用ようして力ちからを節せつ約やくする装そう置ちです。

  An inclined plane is a device that uses a slope to save effort.