knock around/about
1、漫游
He spent a few years knocking around Europe.
他花了几年时间漫游欧洲。
2、表示某物在一个地方但不知确切位置
It must be knocking around here somewhere.
它肯定在这儿某个地方。
knock around/about with sb/together 常与某人交往（或做伴）
Who was that lad you used to knock around with?
以前经常和你混在一起的那个小伙子是谁？
knock sb/sth around/about 接连敲击某人（物）；粗暴对待
He lied to me constantly and started knocking me around.
他经常对我撒谎而且开始打我。
knock sb back
1、阻碍，妨碍（某人取得成果或进步，尤指以回绝方式）
It seemed as though every time we got rolling something came along to knock us back.
每当我们开始着手行动的时候，好像都会出点什么事来拖我们后腿。
2、使某人大吃一惊（或感到惊讶）
Hearing the news really knocked me back.
听到这消息着实让我大吃一惊。
knock sb back sth 用掉某人一大笔钱
That house must have knocked them back a bit.
那房子一定花了他们不少钱。
knock sth back 很快喝掉（酒等）
He was knocking back his 10th gin and tonic of the day.
他正在大口喝着今天的第10杯加奎宁水的杜松子酒。
knock sb down (from sth) (to sth) 说服……降价；使降价；杀价
I managed to knock him down to $400.
我设法让他把价格降到了400元。
knock sb down/over 打倒（或击倒、撞倒）某人
She was knocked down by a bus.
她被一辆公共汽车撞倒在地。
He knocked his opponent down three times in the first round.
他第一局就将对手击倒三次。
knock sth down 推倒（或拆掉、拆毁）建筑物
These old houses are going to be knocked down.
这些旧房子要拆了。
knock sth down (from sth) (to sth) 减价；降价
He knocked down the price from $80 to $50.
他把价格从80元降到了50元。
knock off | knock off sth 停止某事；中断某事；（尤指）下班，收工
Do you want to knock off early today?
你今天想早点歇工吗？
What time do you knock off work?
你什么时候下班？
Let's knock off for lunch.
咱们收工吃午饭吧。
knock sb off 杀死（或干掉、除掉、结果）某人
He had many motives for wanting to knock off Yvonne.
他有很多杀伊冯娜的动机。
knock sth off
1、迅速而轻松地完成
He knocks off three novels a year.
他一年赶出三部小说。
2、偷东西；抢劫某处
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。
to knock off a video recorder
偷录像机
to knock off a bank
抢劫银行
knock sth off | knock sth off sth 降价；减价；使贬值
They knocked off $60 because of a scratch.
因为有擦痕他们将价格降了60元。
The news knocked 13% off the company's shares.
这消息使公司股价下跌13%。
knock sb out
1、使入睡；使昏睡；使不省人事
The blow knocked her out.
这一击把她打昏了。
2、(拳击运动) 击败对手
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、使大吃一惊；使倾倒；给某人留下深刻印象
The movie just knocked me out.
这电影着实令我赞叹不已。
knock sb/yourself out 使筋疲力尽；使疲惫不堪
Don't knock yourself out trying to get the job finished.
不要因为急着完成这项工作而把你自己累垮了。
knock sb out (of sth) 把…淘汰出（比赛）
England had been knocked out of the World Cup.
英格兰队已被淘汰出世界杯赛。
knock sth out 完成；快速而轻易地做成
He knocks out five books a year.
他一年轻松写出五本书。
knock sth together
1、草草做成；匆匆拼凑成
I knocked some bookshelves together from old planks.
我用旧木板拼拼凑凑做了些书架。
2、把两间屋（或两座建筑物）打通
The house consists of two cottages knocked together.
这房子是将两栋小屋的隔墙打通合二为一的。
knock sb up
1、敲门唤醒某人
He went to knock Rob up at 4.30am.
他凌晨4:30去敲门唤醒罗布。
2、使怀孕
When I got knocked up, the whole town knew it.
我怀孕时，整个镇子都知道了。
knock sth up 迅速准备好；快速并轻易做成
She knocked up a meal in ten minutes.
她十分钟就做好了一顿饭。