aggravate vs piss off

aggravate

verb
  • To exasperate; to provoke or irritate. 

  • To make (an offence) worse or more severe; to increase in offensiveness or heinousness. 

  • To make worse; to exacerbate. 

piss off

verb
  • To annoy, anger 

  • To leave, to go away. 

intj
  • Go away! 

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