- knock something off
- knock something off†1. to manufacture or make something, especially in haste. •
I'll see if I can knock another one off before lunch.
•They knocked off four window frames in an hour.
2. to knock off some amount from the price of something, lowering its price.•The store manager knocked 30 percent off the price of the coat.
•Can't you knock something off on this damaged item?
3. to copy or reproduce a product. •The manufacturer knocked off a famous designer's coat.
•They are well known for knocking off cheap versions of expensive watches.
4. Go to knock something off (of) someone or something.
Dictionary of American idioms. 2013.