American Dictionary
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to deliberately destroy a building or wall
The far wall could be knocked down to make the room bigger.
to hit someone with a vehicle so that they are injured or killed
Sue was knocked down just yards from her home.
to reduce a price or amount
They knocked the price of a glass of wine down to $1.45.
to show that something such as an idea or suggestion is not good or useful
It was a theory that was easily knocked down.
