deactivate vs shut off

deactivate

verb
  • to make something inactive or no longer effective 

  • to remove a person or piece of hardware from active military service 

  • to prevent the action of a biochemical agent (such as an enzyme) 

shut off

verb
  • To stop or turn off. 

  • To separate; to isolate. 

How often have the words deactivate and shut off occurred in a corpus of books? (source: Google Ngram Viewer )