threat vs trigger point

threat

noun
  • An expression of intent to injure or punish another. 

  • A person or object that is regarded as a danger; a menace. 

  • An indication of potential or imminent danger. 

verb
  • To press; urge; compel. 

  • To use threats; act or speak menacingly; threaten. 

trigger point

noun
  • An event, arrangement, provocation, etc. that leads a certain, generally violent or angered, action to be taken. 

  • A hyperirritable spot in the skeletal muscle; a point in tender muscle that tends to elicit pain upon pressure or touch. ᵂᵖ 

How often have the words threat and trigger point occurred in a corpus of books? (source: Google Ngram Viewer )