knock

verb
\ ˈnäk \
knocked; knocking; knocks

Definition of knock

 (Entry 1 of 2)

intransitive verb

1 : to strike something with a sharp blow
2 : to collide with something
3a : bustle heard them knocking around in the kitchen
b : wander knocked about Europe all summer
4a : to make a pounding noise
b : to have engine knock
5 : to find fault

transitive verb

1a(1) : to strike sharply
(2) : to drive, force, or make by or as if by so striking was knocked out of the campaign
b : to set forcibly in motion with a blow
2 : to cause to collide
3 : to find fault with always knocking those in authority
knock cold knock dead
: to move strongly especially to admiration or applause a comedian who really knocks them dead
knock for a loop
1a : overcome knocked my opponent for a loop
b : demolish knocked our idea for a loop
2 : dumbfound, amaze the news knocked them for a loop
knock one's socks off
: to overwhelm or amaze one a performance that will knock your socks off
knock on wood
used interjectionally to ward off misfortune
knock together
: to make or assemble especially hurriedly or in a makeshift way knocked together my own bookcase

knock

noun

Definition of knock (Entry 2 of 2)

1a : a sharp blow : rap, hit a loud knock on the door
b(1) : a severe misfortune or hardship
(2) : setback, reversal
2a : a pounding noise
b : a sharp repetitive metallic noise caused by abnormal ignition in an automobile engine
3 : a harsh and often petty criticism the knock on him was that he couldn't handle the pressure

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Examples of knock in a Sentence

Verb

The ball knocked him on the chin. She knocked the glass from his hand. He knocked the baseball over the fence. The ball hit him in the mouth and knocked out one of his teeth. The wind knocked him backwards. The dog knocked against the lamp. My knee accidentally knocked against the table. Skaters were knocking into each other all over the ice. I accidentally knocked my knee against the table.

Noun

He gave him a knock on the head. There was a loud knock at the door. She took some knocks early in her career. He likes praise but can't stand the knocks.
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Recent Examples on the Web: Noun

Those worries have sparked selloffs on Wall Street and around the globe, while negatively affecting oil because of the potential knock-on effects for world oil demand. Amrith Ramkumar, WSJ, "Oil Extends Rebound as Oversupply Fears Ease," 8 Jan. 2019 But the turbochargers that are all but omnipresent in today's two-liter engines don't play nicely with high compression ratios, because the combustion can become erratic and possibly result in engine knock (unwanted detonation of the fuel-air mix). Eric Bangeman, Ars Technica, "Variable-compression engine meets crossover: Infiniti QX50 review," 8 Nov. 2018 CF Adam Haseley had a base knock (1-for-4) to extend his hitting streak to 13 games. Vincent Deblasio, Philly.com, "Phillies minor league report: Joey Meneses, Cole Irvin lead Lehigh Valley to series win," 11 June 2018 American gas pumps display the anti-knock index, which averages a fuel’s RON and MON. Eric Tingwall, Car and Driver, "Automakers See Big Potential in Raising the Octane of Regular Unleaded Fuel," 7 Feb. 2018 One knock against Price’s music is its similarity to that of Dvořák. Brian Wise, WSJ, "Florence Price in Concert and on Disc: A Harvest of Rediscovery," 5 Dec. 2018 The grim knocks of police officers and chaplains at their doors came late Sunday evening. Evan Bush, The Seattle Times, "‘The Property’: A family’s getaway cabin defined its dreams, until a tragic Sunday morning," 24 Sep. 2018 At some point in time, that last knock has to come. Kevin Acee, sandiegouniontribune.com, "Padres strike out in 12 innings after comeback vs. Dodgers," 17 Apr. 2018 The resulting differential equations give us a way to study the knock-on effects of small changes in traffic. Eugenia Cheng, WSJ, "Going With the Flow of Traffic," 9 Nov. 2018

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'knock.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of knock

Verb

before the 12th century, in the meaning defined at intransitive sense 1

Noun

14th century, in the meaning defined at sense 1a

History and Etymology for knock

Verb

Middle English knoken, from Old English cnocian; akin to Middle High German knochen to press

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Statistics for knock

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Time Traveler for knock

The first known use of knock was before the 12th century

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More Definitions for knock

knock

verb

English Language Learners Definition of knock

 (Entry 1 of 2)

: to hit something (such as a door) with the knuckles of your hand or with a hard object (such as a knocker) in order to get people's attention

: to hit (something or someone) in a forceful way

: to touch or hit someone or something in a way that is not planned or intended

knock

noun

English Language Learners Definition of knock (Entry 2 of 2)

: a hard, sharp hit

: the sound made by a hard hit

: an experience that makes you less confident or successful for a period of time : a difficult or painful experience

knock

verb
\ ˈnäk \
knocked; knocking

Kids Definition of knock

 (Entry 1 of 2)

1 : to strike in order to get someone's attention I knocked before entering.
2 : to bump against something without intending to Careful! You knocked the lamp.
3 : to make a pounding noise The car's engine began knocking.
4 : to find fault with Don't knock it till you try it.
5 : to hit forcefully He knocked the ball out of the park.
knock down
1 : to strike to the ground with or as if with a sharp blow
2 : to take apart Knock down the tent before you leave camp.
knock off
: to stop doing something Hey, I don't like that, so knock it off!
knock over
: to cause to fall

knock

noun

Kids Definition of knock (Entry 2 of 2)

1 : a pounding noise I heard a knock at the door.
2 : a sharp blow a knock on the head
3 : a difficult or painful experience You learn from life's knocks.

knock

noun
\ ˈnäk \

Medical Definition of knock

1 : a sharp blow a knock to the head
2 : a sharp pounding noise

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More from Merriam-Webster on knock

Thesaurus: All synonyms and antonyms for knock

Spanish Central: Translation of knock

Nglish: Translation of knock for Spanish Speakers

Britannica English: Translation of knock for Arabic Speakers

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