coup de grâce vs frag

coup de grâce

noun
  • A final blow or shot given to kill a wounded person or animal. 

  • A remarkable finishing action. 

frag

noun
  • A successful kill in a deathmatch game. 

  • A fragmentation grenade. 

verb
  • To hit with the explosion of a fragmentation grenade. 

  • To deliberately kill (one's superior officer) with a fragmentation grenade. 

  • I fragged him but he fell off the ledge afterwards. 

  • To kill. 

How often have the words coup de grâce and frag occurred in a corpus of books? (source: Google Ngram Viewer )