acerbate vs forset

acerbate

verb
  • To exasperate; to irritate. 

  • To make bitter or sour. 

adj
  • Embittered; having a sour disposition or nature. 

forset

verb
  • To upset; hinder. 

  • To beset; surround; invest; surround with difficulties; bar; impede. 

  • To get in front of; intercept; waylay; entrap. 

  • To overpower; give one too much of anything; surfeit. 

  • To overburden or overpower with work; overwork; overtax. 

noun
  • A stratagem. 

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