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English definition of “knock sth off (sth)”

knock sth off (sth)

informal phrasal verb with knock     /nɒk/ verb [T]
to take a particular amount away from a price , value , etc.: Living next door to an empty home can also knock 10% off the value of your own property , say experts . Customers can knock hundreds of dollars off their energy bills by following three simple steps . The supermarket joined the fuel price war yesterday by knocking 5 cents a liter off its petrol and diesel prices .
(Definition of knock sth off (sth) from the Cambridge Business English Dictionary © Cambridge University Press)
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