grinding

noun

a harsh and strident sound (as of the grinding of gears)
耳障りで不快な音（ギアをきしませるような）
material resulting from the process of grinding
研摩する過程から生じる物質
- vegetable grindings clogged the drain
  野菜のくずが排水を妨げる
the wearing down of rock particles by friction due to water or wind or ice
水、風、あるいは氷による摩擦によって岩の粒子がすり減ること

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