hair-trigger vs quicksilver

hair-trigger

adj
  • Unstable; in a situation that could be worsened by the slightest mistake. 

  • Easily angered; having a short temper. 

noun
  • A trigger that will set off a firearm when even a very small pressure is applied. 

quicksilver

adj
  • Unpredictable, erratic or fickle; mercurial. 

verb
  • To overlay with quicksilver. 

  • To treat with quicksilver. 

noun
  • The metal mercury. 

  • An amalgam of mercury and tin applied to the backs of mirrors, quicksilvering. 

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