hang fire vs protract

hang fire

verb
  • To wait or hold back. 

  • To fail to fire immediately when the trigger is pulled. 

noun
  • The situation when a gun does not immediately fire when the trigger is pulled, but may fire shortly after. 

protract

verb
  • To put off to a distant time; to delay; to defer. 

  • To draw out; to extend, especially in duration. 

  • To draw to a scale; to lay down the lines and angles of, with scale and protractor; to plot. 

  • To extend; to protrude. 

  • To use a protractor. 

How often have the words hang fire and protract occurred in a corpus of books? (source: Google Ngram Viewer )