acerbate vs upend

acerbate

verb
  • To exasperate; to irritate. 

  • To make bitter or sour. 

adj
  • Embittered; having a sour disposition or nature. 

upend

verb
  • To affect or upset drastically. 

  • To tip or turn over. 

  • To destroy, invalidate, overthrow, or defeat. 

  • To end up; to set on end. 

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