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IELTS BNC: 2471 COCA: 2240
knifenoun [ C ]uk/naɪf/ us/naɪf/ plural knives

A1 a tool, usually with a metal blade and a handle, used for cutting and spreading food or other substances, or as a weapon刀

a fish/butter/steak knife切鱼用刀／涂黄油用刀／牛排餐刀
I prefer to use a knife and fork.我更愿意用刀叉。
He drew/pulled a knife and stabbed her.他拔出刀，刺中了她。

More examples

Be careful with that knife or you'll cut yourself!

Your table manners are appalling - don't you know how to use a knife and fork?

He said that the man had pointed a knife at him.

You really need a knife with a serrated edge for cutting bread.

In the car the police found guns, knives and other lethal weapons .

Idiom(s)

go under the knife
have your knife into sb
the knives are out
put/stick the knife into sb
twist/turn the knife (in the wound)
under the knife
knifeverb [ T ]uk/naɪf/ us/naɪf/

to attack someone using a knife用刀砍（或刺、戳）

He knifed her in the back.他用刀砍伤了她的背部。
IELTS BNC: 2471 COCA: 2240
knife

noun¹

 1tool for cutting切割工具ADJECTIVE | ... OF KNIVES | VERB + KNIFE | KNIFE + VERB | KNIFE + NOUN | PREPOSITION | PHRASES ADJECTIVE➤blunt, dull (especially NAmE) 鈍刀▸➤sharp鋒利的刀➤serrated鋸齒刀▸➤long長刀➤small小刀➤four-inch, six-inch, etc. * 4 英寸長、6 英寸長等的刀➤rusty生銹的刀➤electric電熱刀▸➤➤plastic, silver, steel塑料刀；銀製刀；鋼刀➤kitchen, table菜刀；餐刀➤bread, butter, fish, steak切麪包刀；塗黃油用刀；食魚用刀；牛排餐刀▸➤butcher, butcher's, chef's屠刀；廚師用刀➤carving, paring (especially NAmE) 切（熟）肉刀；削皮刀➤pocket, Swiss army™小摺刀；瑞士軍刀➤bowie, hunting, sheath (especially BrE) 鮑伊獵刀；獵刀；帶鞘的刀➤butterfly, flick (BrE) 蝴蝶刀；彈簧刀➤Stanley™, utility (NAmE) 史丹利刀；多用途刀➤craft, X-acto™ (NAmE) 工藝刀；美工刀➤palette調色刀➤putty (NAmE) 油灰刀... OF KNIVES➤set一套刀具◇a set of kitchen knives一套菜刀VERB + KNIFE➤pick up拿起刀◇She picked up her knife and fork and started to eat.她拿起刀叉吃了起來。➤lay down, put down放下刀▸➤use用刀◇Use a sharp knife to cut away the spare dough.用鋒利的刀切掉多餘的麪團。➤sharpen磨刀▸➤hold握刀KNIFE + VERB➤cut, slice刀切；刀切片◇That knife doesn't cut very well－it needs sharpening.那把刀切東西不太快了，需要磨一磨。➤clatter刀噹啷作響KNIFE + NOUN➤blade, handle刀刃；刀柄➤block, holder刀架；刀座➤sharpener磨刀器具PREPOSITION➤with a/the knife用刀◇The lines can be cut with a craft knife.可以用裁紙刀裁出輪廓。PHRASES➤the blade of a knife, the handle of a knife刀刃；刀把▸➤go under the surgeon's knife (especially BrE) 接受手術◇He is to go under the surgeon's knife (= have surgery) again on Thursday.星期四他要再次手術。➤a knife and fork一副刀叉
knife

noun²

 2used as a weapon武器ADJECTIVE | VERB + KNIFE | KNIFE + VERB | KNIFE + NOUN | PREPOSITION | PHRASES ADJECTIVE➤long, sharp長刀；利刀➤combat (especially NAmE) 戰刀VERB + KNIFE➤be armed with, carry, have持刀；帶刀；有刀◇She carries a knife in her bag now.她現在包裏裝着刀子。➤brandish, point, wave, wield揮動刀；用刀指着；揮舞刀◇She pointed her knife at Richard.她把刀指向理查德。◇He waved his knife in her face threateningly.他在她面前揮刀威脅。➤draw, draw out, produce, pull, pull out, take out, whip out拔刀；拔出刀；亮出刀；抽出刀◇He suddenly pulled a knife on me.他突然掏出刀子衝着我。◇She suddenly produced a knife from her pocket and started brandishing it.她突然從口袋裏掏出一把刀揮舞起來。➤come at sb with, stab sb with, threaten sb with持刀逼近某人；用刀刺某人；持刀威脅某人◇She stabbed him in the back with a 12-inch knife.她用一把 12 英寸長的刀刺進他的後背。➤plunge, press, push, put, stick, thrust, twist (often figurative) 把刀插入；持刀抵住；用刀捅向；用刀戳；傷口上撒鹽◇He plunged the knife deep into her heart.他把刀直插進她的心臟。◇He pressed the knife tighter against her throat.他把抵在她喉部的刀壓得更緊了。◇Just to twist the knife (= cause additional suffering, tension, etc.), the filmmakers have provided a surprise ending.為了更加悲情，電影製作者早已準備好了一個令人吃驚的結局。➤sharpen, whet磨刀KNIFE + VERB➤cut sth, pierce sth, slash sth, slice sth, slice through sth刀切⋯；刀刺穿⋯；刀猛砍⋯；刀把⋯切成片；刀切穿⋯◇She cried out in pain as the knife slashed her arm.刀砍到她胳膊時她痛苦地大叫了起來。◇She felt a knife slice her wrist open.她感覺到一把刀切開了自己的手腕。➤protrude刀伸出◇He was slumped over his desk with a knife protruding from his back.他趴倒在書桌上，背上插着一把刀。KNIFE + NOUN➤attack, fight持刀襲擊／鬥毆◇a frenzied knife attack亂刀襲擊◇He and his gang had a knife fight one night.一天夜裏，他和他的團夥經歷了一場持刀混戰。➤cut, wound刀口；刀傷▸➤blade刀刃PREPOSITION➤with a/the knife用刀PHRASES➤the blade of a knife, the hilt of a knife刀刃；刀柄➤hold a knife against sb's throat, hold a knife at sb's throat, hold a knife to sb's throat, put a knife to sb's throat用刀抵住某人的喉嚨；把刀架在某人脖子上◇She put the knife to his throat to frighten him into silence.她用刀抵住他的喉嚨，威脅他不要出聲。➤a knife in sb's heart (figurative) 讓某人傷心的話◇Each word he uttered was a knife in her heart.他說的每個字都讓她心如刀割。
IELTS BNC: 2471 COCA: 2240
knife

noun

knife ♦︎ blade ♦︎ dagger ♦︎ scalpel ♦︎ machete ♦︎ cleaver ♦︎ switchblade ♦︎ penknifeThese are all words for tools that have a sharp edge or edges for cutting. 这些词均表示用来切割的刀。PATTERNS AND COLLOCATIONS 句型和搭配◆with a knife / blade / dagger / scalpel / machete / cleaver / switchblade / penknife◆a sharp knife / blade / dagger / penknife◆a blunt knife / penknife◆a long / short knife / blade / dagger◆to hold / use / pick up / put down a knife / blade / dagger / scalpel / machete / cleaver / switchblade / penknife◆to cut sth with a knife / blade / scalpel / machete / penknife◆to stab sb / sth with a knife / blade / dagger◆to chop sth with a knife / machete / cleaver◆to slash sb / sth with a knife / blade / machete◆a knife / blade / dagger / scalpel / machete / penknife cuts sth■ knife (plural knives) [countable] a sharp blade with a handle, used for cutting or as a weapon 刀（用作切割工具或武器）◆Sara placed her knife and fork neatly on the plate.萨拉把刀叉整齐地摆放在盘子上。◆a kitchen / carving / hunting knife菜刀；切肉刀；猎刀◆She was murdered in a frenzied knife attack.她被乱刀砍死了。■ blade [countable] the flat part of a knife, tool or machine, which has a sharp edge or edges for cutting 刀身；刀片；刀刃◆Knife blades are generally made of stainless steel.刀刃通常是用不锈钢制成的。◆Razor blades should always be sharp.剃须刀片应该总是很锋利。ⓘ Blade is also used to mean 'knife' or (more frequently) 'sword'. * blade也可指刀，但更多指剑◆The swordsmen weaved and dodged as their blades clashed over and over again.剑客们在剑锋的反复撞击声中腾挪躲闪。 ■ dagger [countable] a short pointed knife that is used as a weapon 匕首；短剑◆Each man was armed with both sword and dagger.每个人都配备了剑和匕首。■ scalpel ˈskælpəl [countable] a small sharp knife used by doctors in medical operations 解剖刀；手术刀◆The surgeon made the first incision with a wide-bladed scalpel.外科医生用宽口手术刀剖开了第一道切口。■ machete məˈʃeti [countable] a broad heavy knife used as a cutting tool or as a weapon 大刀；大砍刀◆She used her machete to clear a way through the jungle.她用大砍刀在丛林中开出一条路。■ cleaver [countable] a heavy knife with a broad blade, often used for cutting large pieces of meat 砍肉刀；剁肉刀◆With a meat cleaver or heavy chef's knife, cut the chicken into large pieces.用剁肉刀或大厨师刀把鸡剁成大块儿。■ switchblade ˈswɪtʃbleɪd [countable] a knife with a blade inside the handle that jumps out quickly when a button is pressed 弹簧刀◆Owning or carrying a switchblade is illegal in the United Kingdom.在英国，持有或携带弹簧刀是违法的。■ penknife ˈpennaɪf [countable] a small knife with one or more blades that fold down into the handle 小折刀◆He pulled the penknife out of his pocket and opened it.他从口袋里掏出小折刀并将它打开。
IELTS BNC: 2471 COCA: 2240
knife
Knives, forks and spoons: carving fork, carving knife, chopper...
Knives used as tools or weapons: clasp knife, flick knife, jackknife...
Medical equipment: catheter, defibrillator, drain...
To kill a person or animal: kill, murder, strangle...
To injure yourself or someone else: injure, harm, wound...

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