C U 刀 sharp blade with a handle, used for cutting or as a weapon or cutting blade in a machine or tool

　draw a ～　抽出一把刀
　open one's ～　把折刀打开
　play ～ and fork　饱餐一顿
　pull a ～　拔刀
　put a ～ into　用刀刺某人
　dull ～　钝刀
　sharp ～　快刀
　butcher's ～　屠刀
　paper ～　裁纸刀
　pocket ～　随身带的小刀
　table ～　餐刀
　～ rest　刀架
　under the ～　接受外科手术
　cut with a ～　用刀切

　He immersed the knife in boiling water.　他把刀浸入沸腾的水中。
　Blade and handle are the component parts of a knife.　刀身和刀柄是一把刀的组成部分。
　The knife is dull.　那把小刀很钝。
　Is this knife sharp or dull?　这把刀快不快?
　The knife is so dull that it will not cut.　刀子太钝了，切不开东西。
　He is awkward with a knife and fork.　他吃东西用刀叉感到别扭。
　Put your knife and fork down on the plate if you've finished eating.　如果你已吃完饭，把刀叉放在盘子里。
　He carved the meat with a large knife.　他用一把大刀切肉。
　He'd been stabbed four times with a kitchen knife.　有人用厨刀捅了他四刀。
　This is the identical knife with which the murder was committed.　这就是凶手杀人时所用的刀子。
　The jewel thief killed one of the policemen with a knife.　珠宝贼用刀子杀死了一名警察。
　He picked up the knife and stabbed her.　他拿起刀，刺了她。
　I need a knife to spread butter on the bread.　我需要用一把刀在面包上涂黄油。

 ♣ have〔get〕 one's knife in〔into〕 sb
　跟某人过不去，敌视某人　continue to treat sb as an enemy
　Be careful with George; he wants to get his knife in you.　你得提防乔治，他想报复你。
　She has had her knife into the neighbours after the argument about the new fence.　为新栅栏的事争论后，她对邻居有了敌意。
 ♣ like a knife through butter
　容易，遇不到抵抗或困难　easily; without meeting any resistance or difficulty
　The power saw sliced the logs like a knife through butter.　电锯轻而易举地就把原木锯成薄板了。
　His strong voice cut through the hum of conversation like a knife through butter.　他那洪亮有力的声音一下子就压倒了嗡嗡的谈话声。
 ♣ you could cut it with a knife
　很明显，很突出，浓重　it was very obvious or heavy
　His accent is so thick you could cut it with a knife— I can hardly understand a word he says.　他的口音很重——我简直一个字都听不懂。

　vt.　切割，刺 cut or stab with a knife

　～ one's body　砍某人的身体
　～ police　砍警察
　～ the thief　砍小偷
　～ victim　砍被害者
　～ through　穿过

　The criminal knifed his victim in a rage.　那个罪犯暴怒之下用刀砍了被害者。
　The thief knifed his chaser.　那窃贼用刀刺追赶他的人。
　A terrible pain knifed his body.　一阵剧痛像刀割似地穿过他的身体。
　The victim has been knifed.　受害人受到刀伤。
　During the fight he was knifed in the stomach.　在战斗中他的腹部挨了一刀。

 ♣ knife through　(v.+prep.)
　穿过　go through sth
　The cruiser knifed through the heavy sea.　巡洋舰穿过汹涌的大海。
　A new highway knifes through the jungle.　一条新公路穿越森林。

　knife　用作名词时的复数为knives，而用作动词时的单数第三人称则须用knifes.

　［词源］　古英语cnif（刀）