aggravate vs ruffle some feathers

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. 

ruffle some feathers

verb
  • To cause a disturbance; to arouse resentment, anger, or concern. 

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