hold a grudge vs ratty

hold a grudge

verb
  • To stay angry (at someone or something). 

ratty

noun
  • Synonym of knock down ginger (“prank of knocking on a front door and running away”) 

adj
  • In poor condition or repair. 

  • Annoyed, bad-tempered, irritable. 

  • Resembling or characteristic of a rat; ratlike. 

  • Infested with rats. 

  • Crazy, mad; ridiculous; slightly strange, eccentric; also (followed by about, on, or over), attracted to, infatuated with. 

How often have the words hold a grudge and ratty occurred in a corpus of books? (source: Google Ngram Viewer )