knock (something) off

1. to subtract a certain amount from the price of an item.

The manager knocked two bucks off because the dress had a button missing.

If you knock off five dollars, I'd consider buying it.

2. to produce something quickly and easily.

He can usually knock off a short story in just a few days.

• there's much to be said for
• there's much to be said for doing something
• there's much to be said for something
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• there's no law against
• there's no law against doing something
• there's no law against something
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• There's no rest for the wicked!
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• there's the rub
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• the rest is history
• there's ... to be said for
• there's ... to be said for doing something