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knock sb back (sth)

UK informal phrasal verb with knock
 
/nɒk/
 
US  /nɑːk/ verb

Definition

to cost someone a large amount of money: I bet that computer knocked you back several hundred.Costing too muchExpensive and luxurious
(Definition of knock sb back (sth) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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