如题所述
Knock out 与 Knock off 意思不同。
knock out：淘汰；击败；出局；使不省人事
例句与用法:
1. She's knocking herself out with all that work.
她做的工作把她累得筋疲力尽。
2. France knocked Belgium out (of the European Cup).
法国队将比利时队淘汰（出欧洲杯足球赛）了。
knock off：使减少；中止；下班
例句与用法:
1. We knock off at 12:30 for lunch.
我们十二点半时停下工作去吃饭。
2. It's after five; let's knock off.
已经五点多了；下班吧。
拓展阅读：
由knock这个词发展而成不少习惯用语，比如knockout和knock your socks off，其中knockout在俚语中可以解释叫人心醉神迷的人或物，可能是一幅美不胜收的画，也可能是一部扣人心弦的电影，但更可能是俊男美女。
例句：He just married a real knockout, one of the most beautiful women I have ever seen!
他刚娶了个大美人,我还没见过有比她更漂亮的女人。
这里的knockout是令人神魂巅倒的美女。
knock your socks off的出典可能是什么特别精彩的事情让你兴奋得上蹦下跳，以至脚上袜子也跳得掉了下来。
例句：T hat movie I saw last night is fantastic, it'll knock your socks off!
我昨晚看的那电影棒极了，会让你激动万分的。
这里knock your socks off用来描述令人兴奋不已的好事。
本回答被网友采纳Knock off 使减少; 杀死; 下班; 偷（off本身有下降之意）。
拓展资料
Knock out
1、PHRASAL VERB 使不省人事；使入睡
To knock someone out means to cause them to become unconscious or to go to sleep.
He was arguing with his girlfriend and she hit him with a frying pan! Nearly knocked him out...
他和女友争吵时女友竟拿煎锅砸他！几乎把他砸晕了过去。
2、HRASAL VERB 击败；淘汰
If a person or team is knocked out of a competition, they are defeated in a game, so that they take no more part in the competition.
Henri Leconte has been knocked out in the quarter-finals of the Geneva Open...
亨利·勒孔特在日内瓦公开赛四分之一决赛中被淘汰。
3、PHRASAL VERB 摧毁；使瘫痪
If something is knocked out by enemy action or bad weather, it is destroyed or stops functioning because of it.
Our bombers have knocked out the mobile launchers...
我们的轰炸机摧毁了移动火箭发射台。
knock off
1、PHRASAL VERB 使减少；使降低
To knock off an amount from a price, time, or level means to reduce it by that amount.
Udinese have knocked 10% off admission prices...
乌迪内斯队将入场费降低了10%。
2、PHRASAL VERB 从（名单或文件中）删除
If you knock something off a list or document, you remove it.
Tighter rules for benefit entitlement have knocked many people off the unemployment register.
更为严格的救济金申领规定将很多人剔除出了失业登记表。
3、PHRASAL VERB 偷
If someone knocks something off, they steal it.
Cars can be stolen almost as easily as knocking off a bike.
偷汽车几乎能和偷自行车一样容易。
4、PHRASAL VERB 偷；盗
To knock off a house, factory, or shop means to break into it and steal money or property.
...two nervous teenagers knocking off a cafe?
两个紧张不安的青少年抢了一家咖啡馆？
5、PHRASAL VERB 下班；收工
When you knock off, you finish work at the end of the day or before a break.
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。
6、PHRASAL VERB 杀死
If someone knocks someone else off, they kill them.
He had many motives for wanting to knock off Yvonne...
他有很多杀伊冯娜的动机。本回答被网友采纳
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”）。
Knock off 使减少; 杀死; 下班; 偷（off本身有下降之意）。
拓展资料：
knock off
1.He had many motives for wanting to knock off Yvonne
他有很多杀伊冯娜的动机。
2.He has knocked 10 seconds off the world record
他将世界纪录缩短了10秒。
3.When pressed they knock off 10 per cent.
经砍价，他们降了10%。
4.People don't just knock one another off like this unless there's big money at stake.
如果不是为了冒险赚大钱，人们不会像这样彼此残杀。
5.It's time to knock off.
该收工了。
6.When you knock off work, you'll be just in time to catch that bus.
你下班时坐这趟车正好。
knock out
1.You really, uh, knock out sue garvey's front tooth?
你真的把苏加维的门牙打掉了？
2.Our soldiers had the orders to knock out enemy guns.
我们的战士接到了摧毁敌人火力的命令。
3.And then you got your football team to knock out his football team!
之后你的足球队淘汰了他的球队！
4.When boxing, do not expect to have the first punch be a knock out.
在拳击比赛中，不要指望第一拳就将对手击倒在地。
5.We'll knock out the whole street.
我们会破坏整个街道的电力。
6.We had the grenades, but it is very hard to knock out a tank with a hand grenade!
虽然我们有手榴弹，但是想要只用一颗手榴弹就彻底干掉一辆坦克是非常困难的！
本回答被网友采纳vt. 敲落(中止)
例句与用法:
1. We knock off at 12:30 for lunch.
我们十二点半时停下工作去吃饭。
2. It's after five; let's knock off.
已经五点多了；下班吧
knock out:
a. 敲出(击倒,打破,打落)
例句与用法:
1. The film just knocked me out it's the best thing I've ever seen.
这电影好得不得了－－是我看过的最好的一部。
2. France knocked Belgium out (of the European Cup).
法国队将比利时队淘汰（出欧洲杯足球赛）了.
3. Don't drink too much of this it'll knock you out!
这种酒别喝太多--喝多了就醉了!
4. She's knocking herself out with all that work.
她做的工作把她累得筋疲力尽.本回答被提问者采纳
1）Knock off 使减少; 杀死; 下班; 偷（off本身有下降之意）
1,撞倒（常用简单时态）
eg, please knock off your ash before it fails on the carpet .
2, 停止，中断（off 作介词用，不用被动语态）
eg, when the bell rings at 12 o'clock , all the works knock off for lunch.
3, 减去，扣除（常用简单时态）
eg, I'll take both dress if you knock 10 dollars off.
4, 匆忙做完 （常用简单时态）
He knocked off his work in less than a month.
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%。
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”）
击倒 Jack knocked his opponent out in the second round of the contest. 杰克在比赛的第二回合就把对方击倒了。
使昏迷 The drug knocked him out. 麻醉毒品使他昏迷了。
淘汰
Our team was knocked out in the second run. 我们的队在第二轮比赛中被淘汰。
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。
