knock out . stun；render unconscious击昏
He received a blow on the head which knocked him out．他头上被打了一拳就昏倒了。
The falling ladder hit him on the head and knocked him out．梯子倒下来击中了他的头部，把他打昏过去了。
The boxer knocked his opponent out．拳击运动员把对手击晕。
knock out . eliminate from a competition；defeat an opponent by knocking him out of the fight 从比赛中排除
He was knocked out in the second round of this tournament．他在第二轮比赛中就被击败了。
He has now knocked out most of the other competitors．他现在已经压倒了多数其他竞赛对手。
knock out . empty by knocking 磕干净
After knocking out his pipe， the old man went on with his story．老人把烟斗里的烟灰磕干净后，又继续讲故事。
knock out . overwhelm with surprise使震惊；使惊得发呆
For a moment she was completely knocked out by the news．这条消息一下子就使她惊得目瞪口呆。
The beautiful scenery really knocks me out．这美丽的景色简直把我给迷住了。
knock out . play（a tune） rather unskillfully on the piano不熟练地弹钢琴
I am not a very accomplished pianist， but I can knock out a tune．我不是一个好的钢琴演奏者，但能勉强弹奏一曲。
knock out . create or finish roughly or hastily粗率地或匆忙地创作成或完成
He knocked out a plan in half an hour．他半小时就草拟出一个计划。
She knocked out ten letters in one evening．她一个晚上写了十封信。
knock out . make inoperative； destroy使不能使用；破坏；损坏
The telephone communications were knocked out by the storm．电话线被风暴摧毁了。
The power supply system knocked out by the typhoon has been repaired．被台风刮坏的供电系统已经修复。
knock out . make somebody exhausted使（某人）疲劳；使（某人）累垮
He knocked himself out with excessive work．他工作过度，把身体累垮了。
knock out . do one's best； exert oneself to the utmost尽最大努力；竭尽全力
He knocked himself out cramming for the exams．他正竭尽全力赶功课准备应试。
The workers knocked themselves out to fulfil their production quota ahead of time．工人们为提前完成生产指标，把全部气力都使上了。
knock over . strike from an erect to a prone position把…打翻；打倒
He knocked the thief over with one blow．他一拳将小偷打翻在地。
Carelessly， I knocked my teacup over and the tea went all over the table cloth．我不小心把茶杯打翻了，台布上全是茶。
knock over . upset；distress使心烦意乱；使痛苦
The family was completely knocked over at the news．一家人都被这个消息搅得心烦意乱。
knock over . get rid of去掉
They knocked over a lot of difficulties and succeeded at last．他们克服了许多困难，最后终于成功了。
knock over . get through with完成；办完
He knocked over his exercises in half an hour．他在半小时内完成了作业。
knock over . steal； rob偷；抢
These gangsters are experienced in knocking over banks．这些匪徒对抢劫银行是很老练的。
knock up . wake by knocking敲醒
The old man knocked up his grandson by beating gently on the bedroom window．老人轻轻敲卧室的窗户，唤醒了在里面睡觉的孙子。
Will you knock me up at half past seven in the morning please? 你早上七点半敲门把我叫醒好吗?
I’d like to be knocked up early tomorrow． I've an appointment in London at nine o'clock．我希望明天有人早点把我叫醒，我九点钟在伦敦有个约会。
knock up . make ill使疲乏；病倒
Bill must be overworked； he looks badly knocked up．比尔一定是过度劳累了，他看上去疲惫不堪。
Don't knock yourself up trying to finish the job．不要因为急于完成这项工作而把你自己累病了。
I must have a rest；I'm just about knocked up．我得休息一会儿；我差不多精疲力尽了。
Working in the scorching sun all day has knocked me up．在灼热的太阳下工作了一天，我已疲惫不堪了。
knock up . injure； wound伤害
Two kids were badly knocked up in the car accident．那次车祸使两个孩子受了重伤。
Her arm was knocked up a bit，but not seriously．她的手臂撞伤了一点，但并不严重。
knock up . make，as an income，from various sources通过各种渠道赚钱
Andrew knocked up over four thousand pounds last year．安德鲁去年赚了四千多英镑。
I wouldn't mind betting he knocks up almost five thousand pounds a year，one way and another．我敢打赌，他各种收入加起来几乎是一年五千英镑。
knock up . damage；mar损坏；伤害
The children knocked up the new table．孩子们将新桌子弄坏了。
The furniture was pretty much knocked up by the time it arrived．家俱运到时已损坏不少。
knock up . make uneasy；disturb使烦恼；使不安
She was knocked up by her son's serious illness．她儿子病重使她烦燥不安。
knock up . make roughly or in a hurry；prepare hurriedly匆忙制作；匆匆准备
They soon knocked up a shelter for the sheep against the imminent storm．为躲避即将来临的暴风雨，他们赶紧给羊群盖好了一个窝棚。
I'm no carpenter， but I can knock up a bookcase when necessary．我虽不是木匠，但我能应急凑合做个书架。
She knocked up a snack for all of us．她给我们大家匆匆准备了一顿小吃。