dead-end vs rub out

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. 

rub out

verb
  • To kill, especially to murder. 

  • To delete or erase or remove (something) by rubbing. 

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