Longman Dictionary of Contemporary English homepage

knock

2 noun
     
knock2
1 [countable] the sound of something hard hitting a hard surface:
a loud knock at the door
a knock in the engine
2 [countable] the action of something hard hitting your body:
He got a knock on the head when he fell.
3

take a knock

informal to have some bad luck or trouble:
Clive's taken quite a few hard knocks lately.
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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