September 23, 2021
Learner's Word of the Day
knock /ˈnɑːk/ noun
There was a knock at the door.
There was a knock at the door.
Learner's definition of KNOCK

1 a [count] : a hard, sharp hit

  • He gave him a knock on the head.

1 b [count] : the sound made by a hard, sharp hit

  • There was a loud knock at the door.

2 [count] informal : an experience that makes you less confident or successful for a period of time : a difficult or painful experience

  • She took some knocks early in her career.

  • Most performers have their share of knocks [=setbacks] on their way to stardom.

3 [count] informal : a critical or negative comment

  • He likes praise but can't stand the knocks.

4 : a loud noise produced by an engine when it is not working properly


  • We heard a knock in the engine.


  • a type of fuel that reduces engine knock

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