pontificate vs sound off

pontificate

verb
  • To act like a pontiff; to express one's position or opinions dogmatically and pompously as if they were absolutely correct. 

  • To speak in a patronizing, supercilious or pompous manner, especially at length. 

  • To preside as a bishop, especially at mass. 

noun
  • The status or term of office of a pontiff or pontifex. 

sound off

verb
  • To hold forth about something in an opinionated manner. 

  • Command instructing a person to confirm that they are present or that some other objective has been met. 

  • Command instructing a person to speak up or acknowledge something. 

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