An example of knock off is to stop working at 3 P.M.
An example of a knock off is a fake designer purse made to look like a Louis Vuitton.
Don't knock off the ornament with your clumsy arms.
They send people to the shows in Milan for "ideas", which means knocking off the designs they guess would sell.
I think I'll knock off for the evening and go to bed.
They decided to knock off a TV set from the community centre.