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The Collaborative International Dictionary of English v.0.48 (gcide)

Knockdown \Knock"down`\, a.
1. Of force sufficient to fell or completely overthrow; as, a
knockdown blow; a knockdown argument..
[Webster 1913 Suppl.]

2. Designating a rivet end to be formed into a head by
upsetting in fastening.
[Webster 1913 Suppl.]

3. 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.
[Webster 1913 Suppl.]

4. Made or constructed so as to be capable of being knocked
down or taken apart, as for transportation.
[Webster 1913 Suppl.] knock-down-and-drag-out


Knockdown \Knock"down`\, n.
1. That which knocks one down; something that overpowers or
overwhelms, as strong liquor; specif., a kind of ale or
beer that is very strong. [Slang.]
[Webster 1913 Suppl.]

2. A knocking down; a felling by a knock, as of a combatant,
or of an animal; a blow that overwhelms; also, a fist
fight.
[Webster 1913 Suppl.]

3. 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.
[Webster 1913 Suppl.]