dead-end vs go back on

dead-end

verb
  • To come to a dead-end. 

adj
  • Going nowhere; blocked. 

noun
  • A road with no exit. 

  • A position that offers no hope of progress. 

go back on

verb
  • to fail to keep; to renege on. 

  • to be treacherous or faithless to; betray. 

  • Used other than figuratively or idiomatically: see go, back, go back, on. 

How often have the words dead-end and go back on occurred in a corpus of books? (source: Google Ngram Viewer )