0 to take a particular amount away from a price: --
1 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.
We can complete it step by step however long the road is and it can't be completed however short the road is if you don't even mark your footprint.
Vi kan slutföra det steg för steg hur lång vägen än är och den kan inte slutföras hur kort vägen än är om du inte ens markerar ditt fotavtryck.