acerbate vs forbear

acerbate

adj
  • Embittered; having a sour disposition or nature. 

verb
  • To exasperate; to irritate. 

  • To make bitter or sour. 

forbear

verb
  • To control oneself when provoked. 

  • To refuse; to decline; to withsay; to unheed. 

  • To keep away from; to avoid; to abstain from. 

  • To refrain from proceeding; to pause; to delay. 

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