pat oneself on the back vs vaunt

pat oneself on the back

vaunt

noun
  • A boast; an instance of vaunting. 

verb
  • To speak boastfully about. 

  • To boast of; to make a vain display of; to display with ostentation. 

  • To speak boastfully. 

How often have the words pat oneself on the back and vaunt occurred in a corpus of books? (source: Google Ngram Viewer )