put off vs set back

put off

verb
  • To delay (a task, event, etc.). 

  • To procrastinate. 

  • To emit; to give off (an odor, smoke, etc.). 

  • To cause to dislike; to discourage (from doing). 

  • To distract; to disturb the concentration of. 

adj
  • daunted or fazed 

  • offended, repulsed 

set back

verb
  • To delay or obstruct. 

  • To remove from or allow distance. 

  • To install or position behind a boundary or surface, or in a recess. 

  • To cost money. 

  • To reverse, go backwards. 

How often have the words put off and set back occurred in a corpus of books? (source: Google Ngram Viewer )