cast away vs forsake

cast away

verb
  • To discard. 

  • To abandon or maroon. 

  • To eliminate by means of a cast operation. 

forsake

verb
  • To abandon, to give up, to leave (permanently), to renounce (someone or something). 

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