• WordNet 3.6
    • adj knockdown (furniture) easily assembled and dismantled "I bought a knockdown chest at the do-it-yourself store"
    • n knockdown a blow that knocks the opponent off his feet
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Webster's Revised Unabridged Dictionary
    • Knockdown A knocking down; a felling by a knock, as of a combatant, or of an animal; a blow that overwhelms; also, a fist fight.
    • Knockdown Designating a rivet end to be formed into a head by upsetting in fastening.
    • Knockdown Made or constructed so as to be capable of being knocked down or taken apart, as for transportation.
    • Knockdown Of force sufficient to fell or completely overthrow; as, a knockdown blow; a knockdown argument..
    • Knockdown Of or pertaining to the act of knocking down at an auction; specif., designating the price below which an article will not be disposed by the auctioneer.
    • Knockdown Something that knocks down, or takes apart, for packing or removal, as a piece of furniture; also, state of being knocked down, or taken apart.
    • Knockdown That which knocks one down; something that overpowers or overwhelms, as strong liquor; specif., a kind of ale or beer that is very strong.
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Century Dictionary and Cyclopedia
    • knockdown Such as to knock to the ground; hence, overwhelming; irresistible: as, a knock-down blow; a knock-down argument.
    • knockdown Constructed so as to be readily knocked down or taken apart for convenience in transportation; prepared and kept in separate parts, ready to be put together as a whole.
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In literature:

Knockdown after knockdown was his portion.
"The Game" by Jack London
In the best of circumstances it is only rarely that having identified his big bull, the hunter can deliver a knockdown blow.
"The Land of Footprints" by Stewart Edward White
This sort of performance went on for an hour or more, with the knockdowns and other casualities pretty evenly divided between the two.
"Andersonville, complete" by John McElroy
This sort of performance went on for an hour or more, with the knockdowns and other casualities pretty evenly divided between the two.
"Andersonville, Volume 1" by John McElroy
What I can testify to is, that for making you bless the legs you stand on, a knockdown blow is a specific.
"The Adventures of Harry Richmond, Complete" by George Meredith
Not that Nick meant to give up the fight; but if she went to Shasta it would be a knockdown blow.
"The Port of Adventure" by Charles Norris Williamson and Alice Muriel Williamson
Then there was a regular knockdown fight, and the supercargo was put in irons.
"Lippincott's Magazine of Popular Literature and Science, Vol. 11, No. 22, January, 1873" by Various
Souls have in them a wonderful capacity for recovering after knockdown blows.
"The Girl Wanted" by Nixon Waterman
That will help to repay you for that knockdown!
"'Firebrand' Trevison" by Charles Alden Seltzer
Attendants should be bringing forth knockdown fence-panels for her to leap over and hoops of paper for her rider to leap through.
"Sundry Accounts" by Irvin S. Cobb

In news:

Moore is fourth nationally with 10.5 sacks and also leads the SEC in knockdowns and quarterback hurries.
Knockdown joinery makes this cabinet easy to build, easy to assemble and easy to move.
The crew of Cloud Nine experiences a knockdown en route to Emsworth, England.
Iran Play Economic Knockdown .
New insecticide allows fast-acting insect knockdown with exceptionally low odor for improved worker handling, convenience and safety.
AP Photo Peter Quillin stands over Hassan N'Dam after a fourth-round knockdown, one of six the Grand Rapids native scored en route to winning the WBO middleweight championship Saturday at Barclays Center in Brooklyn.
"We like to pride ourselves on knockdowns," Bernard Reedy said.
He had come back from a third round knockdown to drop Marquez in the fifth and was landing big left hands that broke and bloodied the Mexican's nose.
AP Photo Amir Khan collapses into the ropes after the first knockdown he suffered, in the third round of what became a fourth-round technical knockout win for Danny Garcia.
High-throughput applications, such as knockdown studies or target screenings, often include cell transfection.
Former England cricketer Andrew Flintoff beat American Richard Dawson on points after surviving a knockdown in his first professional fight at the MEN Arena in Manchester on Friday.
Tuscaloosa's Deontay Wilder improved his professional record to 24-0, each win by knockdown, Saturday night at the Mobile Civic Center's Expo Hall with a first-round KO of challenger Kerston Marswell.
Wasp -X Wasp and Hornet Spray, featuring the active ingredient Etofenprox, provides quick knockdown of wasps , hornets and yellow jackets.

In science:

The knockdown or knockout of speciļ¬c genes has been predicted to mitigate the consequence of such defects and often recover the ability of the strains to grow .
Controlling Complex Networks with Compensatory Perturbations
Dempsey, Antisense knockdown of the glial glutamate transporter GLT-1, but not the neuronal glutamate transporter EAAC1, exacerbates transient focal cerebral ischemia-induced neuronal damage in rat brain, J.
Wide therapeutic time window for nimesulide neuroprotection in a model of transient focal cerebral ischemia in the rat