Definition from macmillandictionary.com
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Mike had knocked his leg against a table.
He knocked a couple of nails into the door.
They knocked him to the ground.
The force was powerful enough to knock him off balance.
The driver had been knocked unconscious by the impact.
They knocked a hole for the doorway.
They walked up to the door and knocked loudly.
I knocked on his door but got no reply.
The newspapers spend too much time knocking government policy.