abrade vs wear away (at)

abrade

verb
  • To cause the surface to become more rough. 

  • To undergo abrasion. 

  • To rub or wear off; erode. 

  • To wear down or exhaust, as a person; irritate. 

  • To irritate by rubbing; chafe. 

wear away (at)

How often have the words abrade and wear away (at) occurred in a corpus of books? (source: Google Ngram Viewer )