cross the river vs hand in one's checks

cross the river

verb
  • Synonym of pass the river (to die) 

hand in one's checks

verb
  • To die. 

  • Used other than figuratively or idiomatically: see hand in, one's, checks. 

How often have the words cross the river and hand in one's checks occurred in a corpus of books? (source: Google Ngram Viewer )