discontinue vs undertake

discontinue

verb
  • To consciously cease the ingestion or administration of (a pharmaceutical drug). 

  • To interrupt the continuance of; to put an end to, especially as regards commercial productions; to stop producing, making, or supplying. 

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