apply oneself vs discontinue

apply oneself

verb
  • Synonym of strive: to work hard, to complete an activity with good effort and focus. 

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. 

How often have the words apply oneself and discontinue occurred in a corpus of books? (source: Google Ngram Viewer )