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to rub; to chafe
to wear out; to become worn
to lose one's innocence; to become sly
金属同士が擂れると火花が飛ぶことがある。
When metals rub against each other, sparks may fly.
古い衣類の繊維が擂れてほつれ始めた。
The fibers of the old clothing wore down and began to fray.
肌着の縫い目が肌に擂れて赤くなった。
The seams of the underwear rubbed against the skin and turned it red.