key up vs turn off

key up

verb
  • To raise the intensity, excitement, tension, etc., of. 

  • To produce nervous tension in. 

  • To raise the pitch of. 

  • To raise (the whole ring of an arch) off its centering, by driving in the keystone forcibly. 

turn off

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

  • To leave a road; to exit. 

  • 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 key up and turn off occurred in a corpus of books? (source: Google Ngram Viewer )