fishtail vs vary

fishtail

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. 

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

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

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

vary

verb
  • To make of different kinds; to make different from one another; to diversity; to variegate. 

  • To embellish; to change fancifully; to present under new aspects, as of form, key, measure, etc. See variation. 

  • To be or act different from the usual. 

  • Not to remain constant: to change with time or a similar parameter. 

  • To institute a change in, from a current state; to modify. 

  • To change with time or a similar parameter. 

  • To display differences. 

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