You can think of abrasion as one surface taking a layer off another by rubbing. Something hard and rough drags across something softer, and a little of the softer thing goes each time. The word can name that rubbing-away itself, or the bare place it leaves behind.
From the word’s history
Wiktionary traces it to Medieval Latin abrasio, a scraping, from Latin abradere, to scrape off — so the scraping action, not the mark, is what the word originally named.
來源資料把它追到中世紀拉丁文 abrasio（刮這件事），來自拉丁文 abrādō（刮掉）。也就是說，這個字最早指的是「刮」這個動作，而不是刮出來的痕跡。
Wiktionary (kaikki) entry for 'abrasion' supplied in the evidence packet: 'From French abrasion, from Medieval Latin abrasio (a scraping), from Latin abradō (scrape off).' (source_ref kaikki:3f6f69a190036ae4:13451841:32219)
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