open one's mouth vs spraff

open one's mouth

verb

  • to speak 

spraff

verb

  • To speak (in general). 

  • To speak excessively or pointlessly. 

noun

  • Spiel. 

  • Chat, patter. 

  • Speech. 

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