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BNC: 1958 COCA: 2087
knockverbuk/nɒk/ us/nɑːk/

knock verb MAKE NOISE

B1 [ I ] to repeatedly hit something, producing a noise（反复地）敲，击，打

She knocked on the window to attract his attention.她敲敲窗想引起他的注意。
There's someone knocking on/at the door.有人在敲门。
Please knock before entering.进来前请先敲门。

[ I ] specialized engineering If an engine is knocking, it is producing a repeated high sound either because the fuel is not burning correctly or because a small part is damaged and is therefore allowing another part to move in ways that it should not.（发动机）发爆震声，砰砰作响

[ I ] If something such as a pipe knocks, it makes a repeated high sound.（管子等）发碰撞声

More examples

I wish he'd knock instead of just barging in.

He knocked quietly before entering the room.

She knocked on the table to get our attention.

She never knocks before she comes in.

Knock three times, then I'll know it's you.

knock verb HIT

B1 [ I + adv/prep, T ] to hit, especially forcefully, and cause to move or fall碰，撞；碰倒；撞倒

He accidentally knocked the vase off the table.他不小心把花瓶碰下了桌子。
She knocked her head against the wall as she fell.她跌倒时头撞在墙上。
Who knocked over that mug of coffee?谁打翻了那杯咖啡？
[ + obj + adj ] Some thug knocked him unconscious/senseless.有个恶棍把他打昏了。
She took a hammer and knocked a hole in the wall.她拿锤子在墙上砸了一个洞。
knock into each other/knock through

If you knock two rooms into each other or knock two rooms through, you remove the wall between them so that they form one room.把（两个房间）打通

More examples

The force of the wind knocked my hat off.

I knocked over a cup of tea.

The chair knocked against the lamp.

She knocked her head on the cupboard door.

Mind you don't knock the glass over.

knock verb CRITICIZE

[ T ] UK informal to criticize, especially unfairly指摘；挑剔

Don't knock him - he's doing his best.别挑他的刺了——他已在竭尽全力了。

Idiom(s)

be knocking (on) 60, 70, etc.
knock sb's block off
knock sb off their pedestal
knock sth on the head
knock (some) sense into sb
knock sb sideways/for six
knock on wood
knock 'em dead!
knock it off
knock spots off sth
knock the bottom out of sth
knock, knock!
you could have knocked me down/over with a feather

Phrasal verb(s)

knock around
knock around (sth)
knock sb around
knock sb back (sth)
knock back (sth)
knock sb down
knock sb/sth down
knock sth down
knock off (sth)
knock sth off (sth)
knock sth off
knock sb off
knock sb out
knock yourself out
knock sth out
knock sth out of sb
knock sb over
knock sth over
knock sth together/up
knock up
knock sb up
knocknoun [ C ]uk/nɒk/ us/nɑːk/

knock noun [ C ] NOISE

a sudden short noise made when someone or something hits a surface敲击声

There was a knock at/on the door.有敲门声。

knock noun [ C ] HIT

the act of something hard hitting a person or thing（重重的）一击，敲击

He received a nasty knock on the head from a falling slate.一块石板掉下来把他的头重重地砸了一下。

Idiom(s)

the knock at/on the door
take/have a knock
BNC: 1958 COCA: 2087
knock

noun¹

 1firm sharp sound敲擊聲ADJECTIVE | VERB + KNOCK | PHRASES ADJECTIVE➤loud, sharp響亮的／刺耳的敲擊聲➤gentle, light, quiet, soft輕柔的／輕微的／輕輕的／柔和的敲擊聲▸➤timid膽怯的敲擊聲➤sudden突然的敲擊聲VERB + KNOCK➤hear聽到敲擊聲▸➤answer回應敲擊聲◇She hurried to answer the knock at the door.她聽到敲門聲急忙去開門。PHRASES➤a knock at the door, a knock on the door敲門聲◇There was a loud knock at the door.有人大聲敲門。
knock

noun²

 2sharp blow from sth重擊ADJECTIVE | VERB + KNOCK | PREPOSITION ADJECTIVE➤hard, nasty (especially BrE) 沉重的打擊◇the hard knocks of life (figurative) 生活的沉重打擊➤minor (especially BrE) 小打擊VERB + KNOCK➤get, have, take受到擊打；遭到碰撞；遭受打擊◇You've had a nasty knock on the head.你的頭部遭受過重擊。◇Their pride took quite a knock when they lost 5-0. (figurative) 他們以 0 比 5 落敗，自尊受到了沉重打擊。➤give sb/sth給⋯一擊PREPOSITION➤knock on在⋯上的一擊
knock

verb¹

 1hit/bump打；撞擊ADVERB | PREPOSITION | PHRASES ADVERB➤accidentally意外碰撞◇I accidentally knocked the vase over.我不小心把花瓶碰倒了。PREPOSITION➤against撞擊⋯◇The stick knocked against the wall.棍子擊打到了牆上。➤off從⋯打落◇He had knocked one of the pictures off the wall.他打落了牆上的一幅畫。➤on撞在⋯上◇I knocked my head on one of the beams.我的頭撞在了其中一根橫梁上。PHRASES➤knock sb/sth flying撞飛⋯◇He was knocked flying as two policemen came crashing through the door.兩名警察破門而入時他被撞飛了。➤knock sb off balance, knock sb off their feet撞得某人失去平衡；撞倒某人◇The explosion knocked him off his feet.爆炸將他掀翻在地。➤knock sb senseless, knock sb unconscious把某人打昏◇The blow knocked him unconscious.這一擊將他打昏了。➤knock sb to the ground把某人打倒在地
knock

verb²

 2bang on a door敲門ADVERB | PREPOSITION | PHRASES ADVERB➤loudly大聲敲門➤gently, lightly, quietly, softly輕輕敲門➤politely, timidly禮貌地／膽怯地敲門PREPOSITION➤at敲⋯◇Someone knocked loudly at the door.有人大聲敲門。➤on敲⋯◇She knocked timidly on the study door and entered.她怯怯地敲了敲書房門，然後進去了。PHRASES➤without knocking沒有敲門◇Dobson walked straight into her office without knocking.多布森沒敲門就徑直走進了她的辦公室。
BNC: 1958 COCA: 2087
knock noun
⇨ blowknock verb
⇨ knock (knock on the door) ⇨ bang 2 (knock your head on the ceiling) ⇨ hit 1 (knock sth over/down) knock

verb

knock ♦︎ tap ♦︎ drum ♦︎ rapThese words all mean to make a noise by hitting sth quite firmly. 这些词均表示敲响、叩响。PATTERNS AND COLLOCATIONS 句型和搭配◆to knock / tap / rap at sth◆to knock / tap / drum / rap on sth◆to knock / tap / drum / rap with sth◆to knock / rap loudly◆to knock / tap hard / gently■ knock [intransitive] to hit a door, etc. firmly in order to make a noise that will attract sb's attention 敲响，叩响（以引起注意）◆He knocked three times and waited.他敲了三下门，然后等着。◆Somebody was knocking on the window.有人在敲窗户。   see also knock ⇨ hit 1 ■ tap (-pp-) [intransitive, transitive] to hit sth quickly and lightly with your fingers, feet, etc, making a noise 轻敲；轻拍；轻叩◆He was busy tapping away at his computer.他正埋头不停地敲击着计算机键盘。◆The music set everyone's feet tapping.那首乐曲让每个人都不由自主地用脚踏起节拍来。◆He kept tapping his fingers on the table.他不停地用手指轻轻敲着桌子。  see also tap ⇨ pat ▸ tap

noun

 [countable] ◆a tap at / on the door轻轻的叩门■ drum (-mm-) [transitive, intransitive] to hit a surface again and again, making a continuous low noise 连续敲击；咚咚地击打◆Impatiently, he drummed his fingers on the table.他不耐烦地用手指嗒嗒地敲着桌子。◆His fingers drummed on the door frame.他用手指不停地敲着门框。■ rap (-pp-) [intransitive, transitive] to hit sth several times quickly, making a sudden noise （突然连续几次）敲击，击打◆She rapped angrily on the door.她怒气冲冲地敲着门。◆He rapped the table with his pen.他用钢笔敲了好几下桌子。
BNC: 1958 COCA: 2087

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