foisting vs forcing

foisting

noun
  • The act of something being foisted; imposition. 

forcing

noun
  • A technique used to prove the consistency of certain axioms in set theory. See forcing (mathematics). 

  • An extension in the development time of an underexposed negative in order to bring out detail 

  • The net flux of energy in or out of a system; the net change in an energy balance. 

  • The art of raising plants at an earlier season than is normal, especially by using a hotbed 

adj
  • Pertaining to a bid which requires partner to continue bidding rather than pass. 

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