- no obj. strike a surface noisily to attract attention, especially when waiting to be let in through a door（为引起注意而）敲, 敲打, （尤指）敲（门）：
he strolled over and knocked on a door marked Enquiries.
他踱步过去, 敲了标有“问讯处”的门。
- strike or thump together or against something相撞, 碰撞：
my knees were knocking and my lips quivering.
我双膝打颤, 嘴唇发抖。
- (of a motor or other engine) make a regular thumping or rattling noise, e.g. through pinking（马达, 引擎）发出碰撞声, 发出爆发声。
- with obj. collide with (someone or something), giving them a hard blow撞到, 撞击：
he deliberately ran against her, knocking her shoulder
他故意贴着她跑, 撞上她的肩膀
no obj. he knocked into an elderly man with a walking stick.他撞到了一个拄着拐杖的老年人。
- with obj. and adverbial of direction force to move or fall with a deliberate or accidental blow or collision（有意或无意地）碰（或撞）; 碰（或撞）落：
he'd knocked over a glass of water.
他碰翻了一杯水。
- injure or damage by striking打伤, 碰伤：
she knocked her knee painfully on the table
她的膝盖被桌子碰得很疼
figurative 〈喻〉you have had a setback that has knocked your self-esteem.
你遇到了打击自尊心的挫折。
- make (a hole or a dent) in something by striking it forcefully打出（洞, 坑）：
he suggests we knock a hole through the wall into the broom cupboard.
他建议我们在墙上打个洞, 通到放清洁工具的壁橱里。
- demolish the barriers between (rooms or buildings)敲掉（房屋、建筑之间的障碍）：
two of the downstairs rooms had been knocked into one.
两间楼下的屋子已经被凿通成一间了。
- informal talk disparagingly about; criticize〈非正式〉挑剔, 批评。
- with obj. informal approach (a specified age)〈非正式〉达到（一定年龄）：
he's younger than his brother - knocking seventy.
他比他哥哥年轻——快70岁了。
- a sudden short sound caused by a blow, especially on a door to attract attention or gain entry敲打声, （尤指）敲门声。
- mass noun a continual thumping or rattling sound made by an engine（发动机）轰鸣声。
- a blow or collision撞击, 碰撞：
the casing is tough enough to withstand knocks.
包装很结实, 足以抵抗碰撞。
- an injury caused by a blow or collision打伤, 撞伤。
- a discouraging experience; a setback挫折：
the region's industries have taken a severe knock.
该地区的各种产业经历了一场严重挫折。
- informal a critical comment〈非正式〉批评。
- Cricket, informal an innings, especially of an individual batsman【板球】〈非正式〉 （尤指单个击球手的）击球回合：
a splendid knock of 117 against Somerset.
对萨姆塞特队打出的得了117分的绝妙击球回合。
knock someone's block off
- informal hit someone very hard in anger〈非正式〉怒打。
knock the bottom out of
- 见BOTTOM.
knock someone dead
- informal greatly impress someone〈非正式〉给某人留下深刻印象。
knock someone for six
- 见SIX.
knock people's heads together
- 见
BANG1 条bang people's heads together.
knock something into a cocked hat
knock someone into the middle of next week
- informal hit someone very hard〈非正式〉猛打某人。
knock someone （或something）into shape
- 见SHAPE.
knock it off
- informal used to tell someone to stop doing something that one finds annoying or foolish〈非正式〉［用于告诉某人停止做烦人或愚蠢的事］住手, 别闹了。
knock someone on the head
- stun or kill someone by a blow on the head（打头部）打昏; 打死。
knock something on the head
- Brit. informal prevent an idea, plan, or proposal from being developed or carried out〈英, 非正式〉扼杀, 打消（想法, 计划, 建议）。
knock on wood
- 见WOOD 条touch wood.
knock someone's socks off
- 见SOCK.
knock spots off
- Brit. informal easily outdo〈英, 非正式〉轻松地胜过。
the school of hard knocks
- painful or difficult experiences that are seen to be useful in teaching someone about life（有教育意义的）困苦经历。
you could have knocked me （或her, him, 等） down with a feather
- informal used to express great surprise〈非正式〉我（或她、他等）极为惊讶。
knock about（或around）
- informal travel without a specific purpose〈非正式〉漫游, 漂泊：
for a couple of years she and I knocked around the Mediterranean.
我和她在地中海漫游了两三年。
- happen to be present碰巧在场：
it gets confusing when there are too many people knocking about.
这么多的人碰巧在场, 气氛显得混乱。
- chiefly Brit. spend time with someone〈主英〉陪伴（某人）：
she knocked around with artists.
她陪着艺术家们。
knock someone/thing about（或around）
- injure or damage by rough treatment（因粗暴对待而）损害, 伤害。
knock someone back
- reject or discourage a person or their request or suggestion拒绝某人, 挫伤某人。
- cost someone a specified, typically large, amount of money花掉某人一大笔钱：
buying that house must have knocked them back a bit.
买下那幢房子一定花费了他们一大笔钱。
knock something back
- informal consume a drink quickly and entirely〈非正式〉（快速地）喝下, 喝掉。
- work risen dough by vigorous kneading to expel air before baking（烘烤前）揉发好的面团。
knock someone down （或over）
- chiefly Brit. (especially of a vehicle) strike or collide with someone so as to cause them to fall to the ground〈主英〉（尤指机动车）撞倒（某人）：
I was nearly knocked down by a bus.
我差点被一辆公共汽车撞倒。
knock something down
- demolish a building or other structure拆掉, 拆毁（大楼等建筑物）：
the closely packed terraced houses were knocked down in the interests of 'progress'.
为了体现“进步”, 排得很密的联立房屋被拆掉了。
- take machinery or furniture to pieces for transportation（为方便运输）拆开机器（或家具）。
- (at an auction) confirm the sale of an article to a bidder by a knock with a hammer（拍卖中）击锤确认买主。
- informal reduce the price of an article〈非正式〉减低物品价格。
- US informal earn a specified sum as a wage〈美, 非正式〉挣（一定额度的）工资。
- Austral./NZ informal spend a pay cheque freely〈澳/新西兰, 非正式〉大手大脚地花用工资。
knock off
- informal stop work〈非正式〉停止工作, 收工。
knock someone off
- informal kill someone〈非正式〉杀死某人。
- Brit. vulgar slang have sexual intercourse with a woman〈英, 粗俚〉与女人性交。
knock something off
- informal produce a piece of work quickly and easily, especially to order〈非正式〉（尤指按要求）快速而轻松地完成工作。
- informal deduct an amount from a total〈非正式〉从总量中减去（或扣除）一部分：
when the bill came they knocked off £600 because of a little scratch.
账单收到时, 他们因一点擦痕减掉了600英镑。
- Brit. informal steal something〈英, 非正式〉偷东西。
- N. Amer. informal rob a shop or similar establishment〈北美, 非正式〉抢劫商店等。
- informal make an illegal copy of a product〈非正式〉仿冒, 非法复制。
- Cricket score the total needed for victory【板球】取得得胜分：
there was plenty of time for the Middlesbrough batsmen to knock off the runs.
有足够的时间让米德尔斯布勒的击球手取得得胜分。
knock on
- informal grow old〈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？
- （亦作knock the ball on）Rugby illegally drive the ball with the hand or arm towards the opponents' goal line【英橄】（犯规动作）以手或臂向对方球门线传球。
knock someone out
- make a person unconscious, typically with a blow to the head（尤指击头部）打昏。
- knock down (a boxer) for a count of ten, thereby winning the contest（拳击中）判败击倒（指击倒对手使其从1数到10的时间之内不能站起, 从而取胜）。
- ( knock oneself out) informal work so hard that one is exhausted〈非正式〉筋疲力尽。
- informal astonish or greatly impress someone〈非正式〉使震惊, 给…留下深刻印象。
- defeat a competitor in a knockout competition（淘汰赛中）击败对手：
England had been knocked out of the World Cup.
英格兰已被淘汰出世界杯。
knock something out
- destroy a machine or damage it so that it stops working破坏机器（使其不能运转）。
- destroy or disable enemy installations or equipment破坏（敌方装置设备）, 使（敌方装置设备）瘫痪。
- informal produce work at a steady fast rate〈非正式〉快速地做：
if you knock out a thousand words a day you'll soon have finished.
如果你每天写出1,000字, 你将会很快完成。
- empty a tobacco pipe by tapping it against a surface磕净（烟斗）, 敲空（烟斗）。
- Austral./NZ informal earn a specified sum of money〈澳/新西兰, 非正式〉赚（某一数量的）钱。
knock someone over
- another way of saying knock someone down.同knock someone down.
knock something over
- N. Amer. informal rob a shop or similar establishment〈北美, 非正式〉抢劫（商店等）。
knock someone sideways
- informal astonish someone〈非正式〉使震惊。
knock something together
- assemble something in a hasty and makeshift way匆匆拼凑, 草草做成。
knock up
- Brit. informal (in a racket game) practise before formal play begins〈英, 非正式〉（使用球拍的体育运动项目）赛前练习。
knock someone up
- Brit. wake or attract the attention of someone by knocking at their door〈英〉敲门唤醒（或引人注意）。
- informal make a woman pregnant〈非正式〉使怀孕。
knock something up
- Brit. make something in a hurry〈英〉仓促制成。
- Cricket score runs rapidly【板球】得分快速上升。