Struck Off
The Cyclopedic Law Dictionary · Walter A. Shumaker and George Foster Longsdorf; ed. James C. Cahill · 1922
The Cyclopedic Law Dictionary
or KNOCKED DOWN. Property is understood to be "struck off" or "knocked down" when the auctioneer, by the fall of his hammer, or by any other audible or visible announcement, signifies to the bidder that he is entitled to the property on paying the amount of his bid, according to the terms of the sale.
7 Hill (N. Y.) 431, 439.