dead-end vs turn off

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. 

turn off

verb
  • To leave a road; to exit. 

  • To repulse, disgust, or discourage (someone). 

  • To become deactivated; to become powered down. 

  • To power down, to switch off, to put out of operation, to deactivate (an appliance, light, mechanism, functionality etc.). 

  • To rotate a tap or valve so as to interrupt the outflow of liquid or gas. 

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