header vs knockdown

header

noun
  • A headlong fall, jump or dive. 

  • Text, or other visual information, used to mark off a quantity of text, often titling or summarizing it. 

  • A pipe which connects several smaller pipes. 

  • One who puts a head on something. 

  • Text, or other visual information, that goes at the top of a column of information in a table. 

  • A font, text style, or typesetting used for any of the above. 

  • Someone who heads the ball. 

  • A raised tank that supplies water at constant pressure, especially to a central heating and hot water system. 

  • The upper portion of a page (or other) layout. 

  • The first part of a file or record that describes its contents. 

  • A machine that separates and gathers the heads of grain etc. 

  • the first part of a packet or stream, often containing its address and descriptors. 

  • The act of hitting the ball with the head. 

  • A horizontal structural or finish piece over an opening. 

  • The rodeo performer who drives the steer toward the heeler to be tied. 

  • A brick that is laid sideways at the top of a wall or within the brickwork with the short side showing. 

verb
  • To strike (a ball) with one's head. 

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. 

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. 

verb
  • To employ the knockdown technique 

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