conk out vs dead-end

conk out

verb
  • to die 

  • to stop functioning 

  • to fall fast asleep; to sleep soundly 

dead-end

verb
  • To come to a dead-end. 

noun
  • A road with no exit. 

  • A position that offers no hope of progress. 

adj
  • Going nowhere; blocked. 

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