fishtail vs thrash

fishtail

verb
  • To move with the tail swinging from side to side in this way. 

  • To swing the back of a vehicle (originally an aircraft) from side to side. 

  • To cause the back of (a vehicle) to swing from side to side. 

noun
  • The skidding of the back of a vehicle from side to side. 

  • A kind of chisel with a flared blade. 

  • The tail of a fish, or an object resembling this. 

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 fishtail and thrash occurred in a corpus of books? (source: Google Ngram Viewer )