Knock Down
The Cyclopedic Law Dictionary · Walter A. Shumaker and George Foster Longsdorf; ed. James C. Cahill · 1922
The Cyclopedic Law Dictionary
To accept a hid at an auction. So called from the fact that the auctioneer's acceptance of the bid is commonly signified hy a stroke of his hammer. "Knocked down" is synonymous with "struck off."
7 Hill (N. Y.) 439.