If you knock something or someone, you criticize them and say unpleasant things about them. I'm not knocking them: if they want to do it, it's up to them
sound like a car engine that is firing too early; "the car pinged when I put in low-octane gasoline"; "The car pinked when the ignition was too far retarded"
If someone knocks two rooms or buildings into one, or knocks them together, they make them form one room or building by removing a wall. They decided to knock the two rooms into one The spacious kitchen was achieved by knocking together three small rooms
Gaelic cnoc, a round hill, hillock or knoll In general the initial k or c is no longer sounded, but in parts of the West Highlands cnoc may be sounded as 'croc' and is both sounded and written 'cronk' in the Isle of Man
a vigorous blow; "the sudden knock floored him"; "he took a bash right in his face"; "he got a bang on the head"
find fault with; express criticism of; point out real or perceived flaws; "The paper criticized the new movie"; "Don't knock the food--it's free"
To knock someone into a particular position or condition means to hit them very hard so that they fall over or become unconscious. The third wave was so strong it knocked me backwards Someone had knocked him unconscious