knock, knocking -- (the sound of knocking (as on a door or in an engine or bearing); "the knocking grew louder")
Overview of verb knock
The verb knock has 6 senses
knock, strike hard -- (deliver a sharp blow or push :"He knocked the glass clear across the room")
knock -- (rap with the knuckles; "knock on the door")
bump, knock -- (knock against with force or violence; "My car bumped into the tree")
tap, rap, knock, pink -- (make light, repeated taps on a surface; "he was tapping his fingers on the table impatiently")
pink, ping, knock -- (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")
knock, criticize, criticise, pick apart -- (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")
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