Knock down /(?)/

Knock· down

Knock down

n.
  1. To strike down; to fell; to prostrate by a blow or by blows; as, to knock down an assailant.
  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.
  3. To take apart; to dissassemble; as, to knock down a rifle for cleaning.
  4. To reduce or discount the price of; as, the dresses were knocked down to twenty dollars.
  5. To earn (an income).