Meaning of “knock” in the English Dictionary

"knock" in English

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uk /nɒk/ us /nɑːk/

knock verb (MAKE NOISE)

B1 [ I ] to repeatedly hit something, producing a noise:

She knocked on the window to attract his attention.
There's someone knocking on/at the door.
Please knock before entering.

[ 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.

[ I ] If something such as a pipe knocks, it makes a repeated high sound.

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knock verb (HIT)

B1 [ I + adv/prep, T ] to hit, especially forcefully, and cause to move or fall:

He accidentally knocked the vase off the table.
She knocked her head against the wall as she fell.
Who knocked over that mug of coffee?
She took a hammer and knocked a hole in the wall.
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.

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knocknoun [ C ]

uk /nɒk/ us /nɑːk/

(Definition of “knock” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"knock" in American English

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us /nɑk/

knock verb (MAKE NOISE)

[ I ] to repeatedly hit something, producing a noise:

Someone is knocking at the door.
Jane knocked on the window to attract his attention.

[ I ] If an engine is knocking, it makes a repeated noise because of a mechanical problem.

knock verb (MOVE)

[ T ] to push into something or someone, often forcefully, causing the thing or person to move:

Alice accidentally knocked the pot off the table.
The blast knocked him off his feet.

knock verb (CRITICIZE)

[ T ] infml to criticize, esp. unfairly:

She knocks every suggestion I make.

(Definition of “knock” from the Cambridge Academic Content Dictionary © Cambridge University Press)

"knock" in Business English

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knockverb [ T ]

uk /nɒk/ us

to cause a sudden and unexpected change in something such as prices:

His downbeat assessment knocked the company's share price enough to ensure that it failed to rejoin the FTSE 100.
Analysts have warned that price cuts and slowing sales would knock profits.

to affect someone or something badly:

The hotel and conference sector has been knocked sideways by a catalogue of problems in recent years.
Manufacturing redundancies in the area are knocking buyers' confidence.
be knocked by sth The financial markets were badly knocked by the week's political turmoil.

informal to criticize something or someone:

Critics may knock the company, but it's still a good investment.
You can knock him for some things, but you have to give him credit for his record.
come knocking informal

to visit or talk to someone in order to ask for something:

We assist small companies that want to expand their capabilities - if they come knocking, we don't turn them down.
knock on/at sb's door informal

to talk to a person or an organization because you want them to help you, or you want to join them:

In the two years since it launched its first plan, nearly 218,000 investors have knocked on its door.
In 1911, 39 per cent of Britain's working women were domestic servants, now they are knocking at the boardroom door.
knock sth on the head UK informal

to prevent something from happening, or to finally finish something:

The company knocked housing market concerns on the head with a 32% rise in full-year profits.
knock spots off sth/sb UK informal

to be much better than something or someone else:

This ingenious colour viewfinder knocks spots off current LCD displays.
knock sth/sb into shape informal

to take action to get something or someone into good condition:

His arrival on the board has finally knocked the company into shape.
knock the bottom out of sth

to damage something severely, especially by destroying its support:

The rise in mortgage rates really knocked the bottom out of the housing market.

knocknoun [ C ]

uk /nɒk/ us

a situation in which something is badly affected:

Sales of champagne were up over the key Christmas period despite earlier fears of a knock in consumer confidence.

informal a bad experience:

take/suffer/have a knock
In him, we see a man, toughened by his share of hard knocks, who's had to struggle for every success.

a criticism of someone or something:

a knock on sb/sth The biggest knock on internet phones is that they're only as reliable as your broadband connection.

(Definition of “knock” from the Cambridge Business English Dictionary © Cambridge University Press)