cast off vs put off

cast off

verb
  • To discard or reject something. 

  • To let go (a cable or rope securing a vessel to a buoy, wharf, etc.) so that the vessel may make way. 

  • To finish the last row of knitted stitches and remove them securely from the needle. 

  • To estimate the amount of space required by the type used for the given copy. 

put off

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

  • To procrastinate. 

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

  • To distract; to disturb the concentration of. 

  • To delay (a task, event, etc.). 

adj
  • daunted or fazed 

  • offended, repulsed 

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