forfeit vs thrash

forfeit

verb
  • To be guilty of a misdeed; to be criminal; to transgress. 

  • To fail to keep an obligation. 

  • To lose a contest, game, match, or other form of competition by voluntary withdrawal, by failing to attend or participate, or by violation of the rules 

  • To suffer the loss of something by wrongdoing or non-compliance 

adj
  • Lost or alienated for an offense or crime; liable to penal seizure. 

noun
  • Something deposited and redeemable by a sportive fine as part of a game. 

  • A penalty for or consequence of a misdemeanor. 

  • A thing forfeited; that which is taken from somebody in requital of a misdeed committed; that which is lost, or the right to which is alienated, by a crime, breach of contract, etc. 

thrash

verb
  • To move about wildly or violently; to flail; to labour. 

  • To defeat utterly. 

  • To extensively test a software system, giving a program various inputs and observing the behavior and outputs that result. 

  • In computer architecture, to cause or undergo poor performance of a virtual memory (or paging) system. 

  • To beat mercilessly. 

  • To thresh. 

noun
  • A beat or blow; the sound of beating. 

  • thrash metal 

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