cash in vs transmigrate

cash in

verb
  • To die. 

  • To exchange for cash. 

  • To profit from something; to take advantage of an opportunity in order to profit, especially financially. 

transmigrate

verb
  • To pass into another body after death. 

  • To migrate to another country. 

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