scram vs set off

scram

verb
  • To leave in a hurry; to go away. 

  • To scratch (something) with claws or fingernails; to claw. 

  • Of a nuclear reactor or some other thing: to shut down, usually because of an emergency. 

  • To shut down (a nuclear reactor or, by extension, some other thing) for safety reasons, usually because of an emergency. 

noun
  • A shutdown of a nuclear reactor (or, by extension, some other thing), often done rapidly due to an emergency. 

  • The device used to shut down a nuclear reactor; also, the button or switch used to initiate a shutdown. 

  • A scratch, especially caused by claws or fingernails. 

set off

verb
  • To leave; to begin a journey or trip. 

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

  • 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. 

  • To cause to explode, let off. 

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