patter vs shoot one's mouth off

patter

verb
  • To speak glibly and rapidly, as does an auctioneer or a sports commentator. 

  • To spatter; to sprinkle. 

  • To make irregularly repeated sounds of low-to-moderate magnitude and lower-than-average pitch. 

noun
  • A soft repeated sound, as of rain falling, or feet walking on a hard surface. 

  • One who pats. 

  • Glib and rapid speech, such as from an auctioneer or a sports commentator. 

shoot one's mouth off

verb
  • To make reckless or exaggerated statements. 

How often have the words patter and shoot one's mouth off occurred in a corpus of books? (source: Google Ngram Viewer )