n. 1. To strike down; to fell; to prostrate by a blow or by blows; as, to knock down an assailant. [ 1913 Webster ] 2. To assign to a bidder at an auction, by a blow or knock of the auctioneer's hammer; to sell at an auction; as, the vase was knocked down at two thousand dollars. [ 1913 Webster +PJC ] 3. To take apart; to dissassemble; as, to knock down a rifle for cleaning. [ PJC ] 4. To reduce or discount the price of; as, the dresses were knocked down to twenty dollars. [ PJC ] 5. To earn (an income). “plumbers who knock down over a hundred thousand a year.” [ PJC ] | 