follow through vs undertake

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. 

undertake

verb
  • To commit oneself (to an obligation, activity etc.). 

  • To pass a slower moving vehicle on the curbside rather than on the side closest to oncoming traffic. 

  • To take upon oneself; to start, to embark on (a specific task etc.). 

noun
  • The passing of slower traffic on the curbside rather than on the side closest to oncoming traffic. 

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