cast off vs give up

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. 

give up

verb
  • To abandon (someone or something) 

  • To admit defeat, capitulate 

  • Become fully taken over by a certain quality, activity, trait, &c. 

  • To relinquish (something) 

  • To execute a trade on behalf of another broker. 

  • To stop or quit (an activity, etc.) 

  • To surrender (someone or something) 

  • To lose hope concerning (someone or something) 

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