fall away vs go to shit

fall away

verb
  • To get worse. 

  • To cease to support a person or cause. 

  • To perish; to vanish; to be lost. 

  • To diminish in size, weight, or intensity. 

go to shit

verb
  • To become much worse. 

  • To completely fail; to have no result. 

How often have the words fall away and go to shit occurred in a corpus of books? (source: Google Ngram Viewer )