PHRASAL VERB-ERG (使)磨损;(使)磨薄 If you wear something away or if it wears away, it becomes thin and eventually disappears because it is used a lot or rubbed a lot. (使)磨损;(使)磨薄 [Also VERB n PREPOSITION]
It had a saddle with springs sticking out, which wore away the seat of my pants. [VERBPREP. noun]