研とぎ

noun

polishing; grinding; sharpening

Refers to the act or process of sharpening blades, polishing surfaces, or washing rice. Often used in compound nouns like 包丁研ぎ (knife sharpening) or 米研ぎ (rice washing).

• 包ほう丁ちょうの研とぎ方かたを教おしえてもらった。