knock definition, meaning - what is knock in the British English Dictionary & Thesaurus - Cambridge Dictionaries Online

Cambridge Dictionaries online Cambridge Dictionaries online

The most popular online dictionary and thesaurus for learners of English

English definition of “knock”

See all translations

knock

verb 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.
More examples

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? [+ obj + adj ] Some thug knocked him unconscious/senseless. 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.
More examples

knock verb (CRITICIZE)

[T] UK informal to criticize, especially unfairly: Don't knock him - he's doing his best.

knock

noun [C] uk   /nɒk/  us   /nɑːk/

knock noun [C] (NOISE)

a sudden short noise made when someone or something hits a surface: There was a knock at/on the door.

knock noun [C] (HIT)

the act of something hard hitting a person or thing: He received a nasty knock on the head from a falling slate.
(Definition of knock from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
What is the pronunciation of knock?
Add Cambridge dictionaries to your browser to your website

Definitions of “knock” in other dictionaries

Word of the Day

kick off

the time when a game of football starts, or when it begins again after it has stopped because of a goal, etc.

Word of the Day

She’s got very good posture. (How we stand and sit)

by Liz Walter,
May 27, 2015
Recently on this blog, we looked at the words that we use to describe the way we move. This week we’re looking at words for describing our bodies when they are still, whether we are standing or sitting. Since most of us do far too much of this, let’s start with sitting.

Read More 

ancestral health noun

May 25, 2015
diet based on the presumed diet of our Palaeolithic ancestors ‘Ancestral health,’ to use a term popular among Paleo followers, has gone mass.

Read More