knock /nɔk/ vt. & vi. 1. 敲，击，打；相撞，碰撞：knock a ball with a bat 用球棒打球 2. 用于短语动词knock about/around 多次踢/击；放松，旅行：Her husband used to knock her about.她丈夫过去经常打她。I spent most of my time knocking about the house.我大部分时间都在家里不干什么事情。We spent the summer knocking about Europe.夏天我们在欧洲旅游。knock at 敲(门窗等): Who is knocking at/on the door? 谁在敲门? knock against 碰；撞: knock one’s head against the door 把头撞在门上 I knocked against her in the park.我在公园撞见了她。 knock down 打倒，撞倒；拆(屋)；拆卸(机器): He was knocked down by a car. 他被一辆小汽车撞倒了。These old buildings will sooner or later be knocked down. 这些老房子迟早得拆掉。knock into sb. 撞在某人身上：He was in such a hurry that he almost knocked into me. 他如此匆忙，差点撞到我身上。knock off 停止；减少；快速生产：I don’t knock off until six.我要到六点休息/下班。The manager knocked five pounds off because it was damaged.由于这个东西受损，经理减少五英镑。She can knock off (= write) a novel in a couple of weeks.她几个星期就能写一部小说。knock on(非正式)变老：Don't you think you're knocking on a bit for this.你不认为你正为此变老吗？knock out 击昏，击倒；使昏迷；喝醉：A blow on the head knocked him out. 当头一拳把他击倒。Two glasses of the wine knocked me out. 两杯酒就把我弄醉了。knock over（车辆）撞伤，压过去；碰倒：She was knocked over and killed on her way to school. 她在上学的路上被汽车撞了而丧生。I knocked a bottle of wine over while I was reaching for a dish.我去够盘子时把一瓶酒弄翻了。know better than变聪明些，不再相信，不再上当：You ought to know better than to ask that.你应该变聪明些，别问此事。