"knocking" in the noun sense
1. knock, knocking
the sound of knocking (as on a door or in an engine or bearing
"the knocking grew louder"
"knocking" in the verb sense
1. knock, strike hard
deliver a sharp blow or push
"He knocked the glass clear across the room"
rap with the knuckles
"knock on the door"
3. bump, knock
knock against with force or violence
"My car bumped into the tree"
4. tap, rap, knock, pink
make light, repeated taps on a surface
"he was tapping his fingers on the table impatiently"
5. 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"
6. 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
Source: WordNet® (An amazing lexical database of English)
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