pat on the back vs philippic

pat on the back

verb

  • To praise or congratulate. 

noun

  • Praise, congratulations. 

philippic

noun

  • Any of the discourses of Demosthenes against Philip II of Macedon, defending the liberty of Athens. 

  • Any tirade or declamation full of bitter condemnation. 

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