kill off . kill or end completely；destroy 杀绝；毁灭
The invaders killed off all the inhabitants of the town．侵略者杀光了全城的居民。
The factory dumped poisonous wastes into the river and killed off the fish．工厂排出有毒的废水，毒死了河中的鱼。
kill off . extinguish；eliminate 消除；耗尽；去掉
The president suggested a new law but many members of the Congress were against the idea and they killed it off．总统建议立新法，但很多国会议员反对，因此把它否决了。
The lack of enthusiasm killed the project off quickly．由于大家缺乏热情，那项计划很快就不了了之。
kill time . waste time； cause the time to pass more rapidly消磨时间
They killed time by playing cards．他们玩纸牌来消磨时间。
That's all right do stay and chat．I'm killing time till I go home．好吧，再留下来谈一会儿。我在回家前也只是消遣消遣。
To kill time until the exhibition opened， we looked round the shops．因等展览会开门，我们去逛商店消磨时间。
kill two birds with one stone . succeed in doing two things by only one action一箭双雕
Mother stopped at the supermarket to buy some bread and then went to get Jane at the dancing class； she killed two birds with one stone．妈妈在超级市场买了些面包，然后去舞蹈训练班接简回家，她一举两得。
“When you're next in London，come and see me．”“Yes， I'll do some shopping and kill two birds with one stone．”“下次你来伦敦时就来看看我。”“当然，我还将买点东西，一举两得嘛。”
kill sb/sth with kindness 宠坏
And I am not going to kill you with kindness. 我可不会宠坏你。
It is very easy to kill values-led companies with kindness he says. 他表示：好心很容易扼杀价值观驱动型的公司。
kind of . almost but not quite有点儿；有几分
Bob was kind of tired when he finished the job．鲍勃完成工作后有点累。
knock about . knock around . travel without a plan； wander with no fixed aim漫游；无目的地游逛
After graduating from college，Joe knocked about for a year seeing the country before he went to work in his father's business．乔大学毕业后用一年时间周游全国，然后才去他父亲的商行上班。
He's not yet thirty， but he's knocked about the world a good deal．他还没到三十岁，但已在世界上跑了不少地方。
He has been knocking about Africa most of his life．他已经在非洲旅行大半辈子了。
knock about . knock around . beat with the fists； mistreat physically or mentally拳打；虐待
The boxer knocked his opponent about all over the ring．拳击者把对方打得在拳击场上打转。
He knocks his wife about a bit．他有点虐待妻子。
He was often knocked about by the shop owner during his apprenticeship．他在学徒期间常常遭到店老板的虐待。
I wish they'd stop knocking their children about．希望他们别再虐待他们的孩子。
knock about . knock around . damage； knock continually and damage（furniture， decorations，）破坏；不停地敲打以致破坏（家俱或装饰物）
The harvest was badly knocked about by the storm．由于那场暴风雨，庄稼的收成遭到了破坏。
I don't like the children playing in this room， for fear they knock the furniture about．我不喜欢孩子们在这房间里玩，怕他们把家俱弄坏。
knock about . knock around . lie about here and there；be found or seen； going about到处乱放；被找到；到处走动
That old thing has been knocking about the house for years．那件旧东西随便丢在家里已经好些年了。
The book is now out of print， but there are probably still copies of it knocking about in the libraries and bookshops．这本书已经绝版了，但在图书馆或书店也许还能找到几本。
There seem to be a lot of policemen knocking about in this district tonight．今晚在这地区似乎有许多警察到处巡逻。
knock against . meet somebody unexpectedly偶然碰到某人
Who do you think I knocked against in the school this morning? 你猜今天我在学校遇到谁了?
I knocked against Mr．Smith in the park this afternoon．今天下午我在公园碰到了史密斯先生。
knock away . knock repeatedly， as at a door不停地敲（门）
I've been knocking away for ages，but nobody has answered the door．我敲门敲了很长时间，可没人开门。
knock back . consume quickly迅速用光；喝光
He knocked back two double whiskies．他一口气喝光了两杯双料威士忌。
knock back . cost花费
How much did your new jacket knock you back? 你那件新上装花多少钱买的?
That car must have knocked her back a few pounds！那辆轿车肯定花了她好些英镑！
knock back . shock； stun震惊
This unexpected news fairly knocked me back！这出人意料的消息使我颇为震惊！
This kind of news knocks you back a bit， doesn't it? 这消息有点使你吃惊，是吗?