enervate vs knock someone out

enervate

adj
  • Made feeble; weakened. 

verb
  • To weaken morally or mentally. 

  • To partially or completely remove a nerve. 

  • To reduce strength or energy; debilitate. 

knock someone out

How often have the words enervate and knock someone out occurred in a corpus of books? (source: Google Ngram Viewer )