flog vs thrash

flog

verb
  • To defeat easily or convincingly. 

  • To overexploit (land), as by overgrazing, overstocking, etc. 

  • To sell. 

  • To steal something. 

  • To use something to extreme; to abuse. 

  • To beat away charcoal dust etc. using a flogger. 

  • To whip or scourge as punishment. 

noun
  • A contemptible, often arrogant person; a wanker. 

  • A weblog designed to look authentic, but actually developed as part of a commercial marketing strategy to promote some product or service. 

thrash

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

  • To beat mercilessly. 

  • To thresh. 

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

  • thrash metal 

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