Definition of knock down phrasal verb from the Oxford Advanced American Dictionary

 

knock down

 phrasal verb
phrasal verb
 
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Phrasal Verbs

knock somebody down (from something) (to something)

(informal)
 
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to persuade someone to reduce the price of something I managed to knock him down to $400.

knock somethingdown

 
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to destroy a building by breaking its walls synonym demolish These old houses are going to be knocked down.

knock somethingdown (from something) (to something)

(informal)
 
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to reduce the price of something He knocked down the price from $80 to $50. see also knock-down
See the Oxford Advanced Learner's Dictionary entry: knock down