Knock        0  119 reads


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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