cud vs mumble

cud

verb
  • To bring back into the mouth and chew a second time. 

noun
  • The portion of food which is brought back into the mouth by ruminating animals from their first stomach, to be chewed a second time. 

mumble

verb
  • To chew something gently with closed lips. 

  • To speak unintelligibly or inaudibly; to fail to articulate. 

noun
  • A quiet or unintelligible vocalization; a low tone of voice. 

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