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to be worn down; to wear away; to wear out
to dwindle; to be reduced
靴底が完全に擦り減った。
The soles of the shoes were completely worn down.
長年使われ、階段は擦り減って滑りやすい。
Having been used for many years, the stairs have worn away and become slippery.
タイヤは回転させないと偏って擦り減る。
If you don't rotate the tires, they will wear down unevenly.