1）knock at（介词at表示的隐含意义为主语与at后所跟有宾语的接触为点接触，接触面小，多用于敲门）打， 捶， 敲; 挝Knock at my window at eight o'clock and I'll be ready.8点钟敲我的窗，我会准备好的。2 Knock out淘汰; 击败; 出局; 使不省人事（out这里是副词，knock用作及物动词，直接接宾语，out用其本身意“出”）This little lady will knock out a tank at 300 yards.这个小玩意能击毁300码远的坦克.The boxer scored a knock out. 这位拳击手将敌手击昏得分.3）Knock over偷窃; 碰翻; 使吃惊; 轻易击败（over有翻转过来之意）The racoons knock over the rubbish bins in search of food, and strew the contents all over the ground.浣熊弄翻垃圾箱找吃的，把垃圾弄得满地都是。Mike can knock over three or four of those simple drawings in a day. 迈克一天可完成三四张那样简单的图画.Miss Ley trembled lest he should knock her china over as he went roundthe room.当他走进房间时,莱伊小姐害怕得打颤,唯恐他撞碎她的瓷器. 4）Knock off 使减少; 杀死; 下班; 偷（off本身有下降之意）If I get this report finished I'll knock off early.如果我写完这篇报告，我就会早点下班。When pressed they knock off 10 per cent.经砍价，他们降了10%。
