demobilize vs set off

demobilize

verb
  • To disband troops, or remove them from a war footing. 

  • To release someone from military duty, especially after a war. 

set off

verb
  • To cause to explode, let off. 

  • To put into an angry mood; to start (a person) ranting or sulking, etc. 

  • To leave; to begin a journey or trip. 

  • To enhance by emphasizing differences. 

  • To offset, to compensate for: to reduce the effect of, by having a contrary effect. 

  • To deface or soil the next sheet; said of the ink on a freshly printed sheet, when another sheet comes in contact with it before it has had time to dry. 

  • To begin; to cause; to initiate. 

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