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to rub; to chafe
to wear out; to become worn
to lose one's innocence; to become sly
ロープが岩に磨れて切れそうになっている。
The rope is rubbing against the rock and about to break.
長年使い続けた靴底が磨れて薄くなった。
The soles of shoes worn for many years have worn thin.
新しい靴が足に当たって皮膚が磨れた。
The new shoes rubbed against my feet and chafed the skin.