knock Definition

  • 1to hit something, especially a door, with the knuckles of your hand or with a hard object in order to attract attention and gain entry
  • 2to make a noise by hitting something hard against a surface
  • 3to criticize or find fault with someone or something

Using knock: Examples

Take a moment to familiarize yourself with how "knock" can be used in various situations through the following examples!

  • Example

    She knocked on the door but no one answered.

  • Example

    He knocked his head against the wall in frustration.

  • Example

    The critics knocked the movie for its poor plot.

  • Example

    I always knock before entering someone's room.

knock Synonyms and Antonyms

Synonyms for knock

Antonyms for knock

Phrases with knock

  • stop doing something annoying or irritating


    Hey, knock it off! You're making too much noise.

  • to touch or tap on something made of wood, usually to avoid tempting fate after making a positive statement


    I haven't been sick all year, knock on wood.

  • knock someone's socks off

    to greatly impress or surprise someone


    Her performance in the play really knocked my socks off.

Origins of knock

from Old English 'cnocian'


Summary: knock in Brief

To 'knock' [nɑk] is to hit something with the knuckles of your hand or a hard object, make a noise by hitting something hard against a surface, or criticize someone or something. It can be used in phrases like 'knock it off,' meaning to stop doing something annoying, and 'knock on wood,' which is a superstitious phrase to avoid tempting fate. 'Knock someone's socks off' means to greatly impress or surprise someone.

How do native speakers use this expression?