knock down
1．knock to the floor or ground击倒；击败
He knocked his opponent down．他击败了对手。
With one blow he knocked his assailant down．他一拳就把袭击他的人打倒在地。
2．strike and cause to fall撞倒
The girl was knocked down by a lorry as she ran across the road．这女孩在跑过马路时被卡车撞倒了。
He was knocked down by a car and was rushed to the hospital．他被汽车撞倒后，随即被送进医院。
3．signify the sale of an article at auction by a blow of the hammer 拍卖时击槌以示卖出
The picture was knocked down to me for ＄ 20 at an auction．这幅画在拍卖中以20美元卖给了我。
The auctioneer knocked the bureau down to a furniture dealer from York．拍卖人把那张写字台卖给约克的一个家俱商。
A mahogany table was knocked down for five pounds．一张桃花心木桌以5英镑的价钱卖出去了。
4．compel sb． to lower the price of 迫使减价；压价
He asked ＄500 for his car， but I managed to knock him down by 10percent．他出价 500美元卖他的车子，但我竭力使他减价10％。
The price was knocked down to ￡5．价格降低到了5镑。
The storekeeper decided to knock down his remaining winter stock．店主决定将剩余的冬季存货减价出售。
5．take apart in handling or transportation拆散；拆零（以便装运）
London Bridge was knocked down stone by stone and rebuilt in the middle of a desert in the United States．伦敦大桥被一块石头一块石头地拆除了，重新安装在美国的一片沙漠中心。
We knocked down the bookcase and packed them in the car．我们将书橱拆散装进汽车。
6．tear down； demolish拆毁；拆除
These old houses will be knocked down to make room for a stadium．这些旧房子将被拆除，以腾出地方来造一座体育馆。
We are going to knock down those old buildings．我们不久就要拆除那些旧建筑物。
7．embezzle money from one's employer盗用雇主之钱
He knocked down plenty of the cash without being caught．他盗用了不少现金，未被发觉。
8．receive，as a salary or a scholastic grade； earn挣得（薪金）；获得（分数）
He knocks down about ＄12，000 a year．他一年大约赚1万2千美元。
9．call upon要求
The chairman knocked her down for a song．主席要求她唱一支歌。
10．cause（a sailing vessel） to heel，as by a gust of wind，to such a degree that it cannot right itself （风）使船倾斜
Lower the sail or the boat will be knocked down．把帆放下来，否则船会被风吹翻的。