caw vs roll on

caw

verb
  • To make the harsh cry of a crow, rook, or raven. 

intj
  • A rendering of the vocalisation of a crow or other corvid. 

noun
  • The harsh cry of a crow. 

roll on

verb
  • To snitch or tattle (on a person or group), to reveal a secret under pressure, usually regarding criminal matters. 

  • To pass; to go on; to elapse. 

  • To continue to move forwards. 

intj
  • Used to express anticipation 

How often have the words caw and roll on occurred in a corpus of books? (source: Google Ngram Viewer )