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v (1)敲，擊，打(strike a sounding blow，as in seeking admittance，calling attention，or giving a signal;hit;strike)[I，I+prep，T+n，T+n+prep]：Please～before entering. 進來前請敲門。～at (on) the door/the window 敲門/窗;～on wood for luck 擊木求好運;～sb's head 敲某人的頭;～sb on the head 打某人的頭;～a cup off the table 碰掉桌上的杯子;～one's knee against the chair 自己的膝蓋撞在椅子上;～oneself on the corner of the table 自己碰到桌角上;～some nails into the wall 把釘子釘在墻上;〖同〗strike，hit，tap，bang;

(2)把……擊(撞)使成某種狀態(tài);打(敲)成……((cause to)be in a certain state or position by hitting;drive，force or render by striking)[C+n+adj，C+n+ing，T+n+prep]：～sb senseless/unconscious/flat with one punch 一拳把某人擊昏/擊得失去知覺/擊倒;～sb's drink flying 把某人的酒碰翻;～a hole in the wall/the fence/the door 在墻/籬笆/門上打個洞;～sb sideways(infml)擊敗;使目瞪口呆;〖同〗 hit，strike，slam，pound;

(3)找碴兒，挑剔(find fault with or criticize，etc unfairly)[T+n](infml)：be too fond of～ing others 太愛找別人的碴兒;～sb's work/sb's latest play/one's country's foreign policy 挑剔別人工作/他人最新劇本/自己國家外交政策的毛病;〖同〗criticize，abuse，condemn;

(4)(發(fā)動機等)因故障而發(fā)出爆震或砰砰聲((of an engine) make a noise because sth is wrong)[I]：The engine of our car is～ing badly.我們汽車的發(fā)動機發(fā)出很大的爆震聲響。

knock spots off (infml) 遠遠勝過： Tom can～spots off me at tennis. 湯姆打網(wǎng)球比我好得多。

knock the bottom out of sth 破壞，使失?。篢he new law～ed the bottom out of his investment almost overnight. 這條新法律幾乎一夜之間使他的投資蕩然無存。

knock the stuffing out of sb (infml) 使懊喪(士氣低落)： Jennie's failure in the exam has～ed all the stuffing out of her. 考試不及格使珍妮懊喪不已。

you could have knocked me down with a feather (infml) 我大為吃驚： We all thought that my uncle was dead，so when he walked into the room you could have～ed me down with a feather!我們都認(rèn)為我叔叔死了，所以當(dāng)他走進屋時，我簡直驚呆了!

knock about (v adv/prep)(infml) 1)漫游，流浪(vi)：Our elder son has been～ing about(on) the Continent for several months. 我們的大兒子已經(jīng)游歷歐洲大陸數(shù)月之久。2)毆打;粗暴地對待(vt)：If that man～s his wife about any more he'll be sent to prison. 如果那男子再虐待他妻子，他將被送進監(jiān)獄。

knock back (v adv)(infml) 1)痛飲(vt)：～back a pint of beer 迅速飲了一品脫啤酒;2)花費(錢)(vt 無pass)：How much did that new watch～you back? 那只新表花了你多少錢? 3)使吃驚(vt)：The news～ed him back. 這消息使他大吃一驚。

knock down (v adv) 1)拆掉(vt 常 pass)：These old houses are to be～ed down. 這些舊房子將被拆除掉。2)撞倒(vt 常pass)：He was nearly～ed down by a taxi.他差一點被一輛出租車撞倒。3)使減價，把(價錢)壓低(vt 常pass)：He～ed down the price by ten per cent. 他把價格壓低了10%。4)(以低價)拍賣掉 (vt 常pass)： A mahogany table was～ed down for five pounds. 桃花心木的桌子以五英鎊的低價被拍賣掉。

knock off (v adv) 1)減價，扣掉(vt)：They～ed five pounds off the price. 他們把價格降低了五英鎊。2)停止(工作)(infml)(vt & vi)：My health compels me to～off (work). 我的健康狀況迫使我停止工作。3)迅速完成(infml)(vt)：The boy～ed off his homework in half an hour. 那小男孩半小時之內(nèi)匆忙完成了作業(yè)。4)盜，搶;殺(sl)(vt)：Who's～ed off my coat? 誰偷了我的上衣? They～ed off a bank. 他們搶了一家銀行。

knock out (v adv) 1)(拳擊中)擊敗對手(vt)：The boxer～ed out his opponent in the second round. 該拳擊手在第二輪中把對手擊敗。2)使失去知覺，使昏迷(infml)(vt)：A blow on the head～ed him out. 頭上挨的一擊使他昏迷不醒。3)使震驚(infml)(vt)：She was～ed out by the news. 她被那消息驚得目瞪口呆。4)摧毀(vt)：The soldier～ed out two enemy tanks with his bazooka. 那戰(zhàn)士用反坦克火箭筒擊毀了敵軍兩輛坦克。5)磕凈煙斗(vt)：K～out your pipe and then refill it. 磕凈煙斗，再裝一袋。6)淘汰(vt)：Our team were～ed out of the competition in the second game. 第二局我們隊被淘汰。

knock over (v adv) 打翻(vt)：Who～ed that bottle over? 誰打翻了那瓶子?

knock together(v adv)粗糙地制作(vt)： They～ed together a rough box with wooden boards. 他們用木板草草地做成一個粗糙的箱子。

knock up (v adv) 1)敲門叫醒(BrE)(infml)(vt)：Tell him to～me up at six o'clock. 告訴他6點鐘叫醒我。2)倉促建造(vt)：We～ed up a hut for the mountain climbers. 我們?yōu)榈巧竭\動員匆匆搭起了一個小屋。3)使懷孕(AmE)(sl)(vt)：If you～your girlfriend up you'll be in trouble with her family. 如果你使你的女朋友懷孕，你會和她家有麻煩的。4)(網(wǎng)球，羽毛球等)賽前練習(xí)(vi)：The players are allowed to～up for three minutes before starting the game. 比賽前允許運動員練習(xí)三分鐘。

→′knockabout adj 喧(吵)鬧的;′knock-down adj 能拆卸的;廉價的;′knocker n 敲擊者(物);門環(huán);吹毛求疵的人;knock-′kneed adj 膝內(nèi)翻的;knock-′on n(橄欖球)要接球時用手將球擊向前方的犯規(guī)動作;knock-′on effect n 間接的負面影響;′knock-out n 擊倒;淘汰賽;異常動人的人;強麻醉藥;′knock-up n 賽前的準(zhǔn)備活動;

n (1)敲(叩)擊;敲擊(門)聲(act or sound of knocking)[C]：get a nasty～on the head 頭撞得很厲害;hear a～at the door 聽到敲門聲;hard～s激烈的碰撞;〖同〗stroke，hit，bang，tap，pat，crash，crack;

(2)挫折，不愉快的事(unfortunate experience)(infml)[C]：have a few/suffer some hard～s 遭受不少挫折;take a～(infml)遭受金錢或精神打擊;

(3)(發(fā)動機等的)震動聲(noise resulting from incorrect functioning of some part of an engine)[C];

【辨異】knock與bang和bump的區(qū)別見BANG。