do away with vs expunge

do away with

verb
  • To abolish; to put an end to; to eliminate. 

  • To have someone killed. 

expunge

verb
  • To eliminate completely; to annihilate. 

  • To delete permanently (e-mail etc.) that was previously marked for deletion but still stored. 

  • To erase or strike out. 

How often have the words do away with and expunge occurred in a corpus of books? (source: Google Ngram Viewer )