follow through vs perseverate

follow through

verb
  • To execute or complete a commitment. 

  • to continue moving the arms (and any held implements, such as a bat or club) or legs after striking e.g. a ball. 

  • To defecate unintentionally as a result of a cough or sneeze, etc. 

perseverate

verb
  • To persist in doing something; to continue to repeat an action after the original stimulus has ended. 

  • To cause the perseveration of (a given reflex or response). 

How often have the words follow through and perseverate occurred in a corpus of books? (source: Google Ngram Viewer )