backlash vs knockdown

backlash

noun
  • A sudden backward motion. 

  • A negative reaction, objection or outcry, especially of a violent or abrupt nature. 

  • The jarring or reflex motion caused in badly fitting machinery by irregularities in velocity or a reverse of motion. 

  • The looseness through which one part of connected machinery, as a wheel, gear, piston, or screw, can be moved without moving the connected parts, or a measurement of the distance moved thereby; either intentional (as allowance) or unintentional (from error or wear). 

verb
  • To cause or set off a backlash. 

knockdown

noun
  • a short pass played downwards, for example from the head onto someone's feet. 

  • The condition of a sailboat being pushed abruptly to horizontal, with the mast parallel to the water surface. 

  • An act of knocking down or the condition of being knocked down. 

  • A shelter erected for use as a temporary dressing room. 

  • A collection of parts required to assemble a product, typically manufactured in one region and exported elsewhere for assembly. 

  • A genetically modified organism that carries one or more genes in its chromosomes that have been made less active or had their expression reduced. 

  • The use of a reagent such as an oligonucleotide with sequence complementary to an active gene or its mRNA transcript, to interfere with the expression of said gene. 

  • An overwhelming blow. 

verb
  • To employ the knockdown technique 

adj
  • To be formed into a head by upsetting in fastening. 

  • reduced in price, originally to a price below which an article would not be sold by the auctioneer 

  • powerful enough to overwhelm or knock down 

  • Capable of being taken apart for packing or removal. 

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