[knock.down] adj (1690) 1: having such force as to strike down or overwhelm "a bewildering assortment of ~ arguments --J. W. Krutch"
2: that can easily be assembled or disassembled "a ~ table" 3 chiefly Brit: extremely low: reduced "~ prices"
[2]knockdown n (1809) 1: the action of knocking down
2: something (as a blow) that strikes down or overwhelms
3: something (as a piece of furniture) that can be easily assembled or disassembled