devolve vs undertake

devolve

verb
  • To delegate (a responsibility, duty, etc.) on or upon someone. 

  • To be inherited by someone else; to pass down upon the next person in a succession, especially through failure or loss of an earlier holder. 

  • To degenerate; to break down. 

  • To fall as a duty or responsibility on or upon someone. 

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 devolve and undertake occurred in a corpus of books? (source: Google Ngram Viewer )