hold to vs undertake

hold to

verb
  • To compel (someone) to remain faithful to (a commitment, moral standard, etc.). 

  • To adhere strongly to (a conviction, story, etc.). 

  • To share or subscribe to (a belief, 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 hold to and undertake occurred in a corpus of books? (source: Google Ngram Viewer )