KNOCKDOWN (4)

Knock″down′, n. 1. 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.
2. 2. A knocking down; a felling by a knock; a blow that overwhelms; also, a fist fight.
3. 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.