hang fire vs hasten

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. 

hasten

verb
  • To move or act in a quick fashion. 

  • To cause some scheduled event to happen earlier. 

  • To make someone speed up or make something happen quicker. 

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