1. To rub or wear off; erode.
  2. To wear down or exhaust, as a person; irritate. <ref name=SOED/>
  3. To irritate by rubbing; chafe. <ref name=SOED/>
  4. To cause the surface to become more rough.
  5. To undergo abrasion.

Verb (etymology 2)

The above text is a snippet from Wiktionary: abrade
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