stir vs trigger point

stir

noun
  • agitation; tumult; bustle; noise or various movements. 

  • The act or result of stirring (moving around the particles of a liquid etc.) 

  • Public disturbance or commotion; tumultuous disorder; seditious uproar. 

  • Jail; prison. 

  • Agitation of thoughts; conflicting passions. 

verb
  • To incite to action. 

  • Of a feeling or emotion: to rise, begin to be felt. 

  • To disturb the relative position of the particles of (a liquid or similar) by passing an object through it. 

  • To begin to move, especially gently, from a still or unmoving position. 

  • To be in motion; to be active or bustling; to exert or busy oneself. 

  • To bring into debate; to agitate. 

  • To rise from sleep or unconsciousness. 

  • To disturb the content of (a container) by passing an object through it. 

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 stir and trigger point occurred in a corpus of books? (source: Google Ngram Viewer )