knocking

(noun) the sound of knocking (as on a door or in an engine or bearing). Synonyms: knock. Example: "The knocking grew louder."

(verb) deliver a sharp blow or push :"He knocked the glass clear across the room". Synonyms: knock, strike hard.

(verb) rap with the knuckles. Synonyms: knock. Example: "Knock on the door."

(verb) knock against with force or violence. Synonyms: bump, knock. Example: "My car bumped into the tree."

(verb) make light, repeated taps on a surface. Synonyms: tap, rap, knock, pink. Example: "He was tapping his fingers on the table impatiently."

(verb) sound like a car engine that is firing too early. Synonyms: pink, ping, knock. Examples: "The car pinged when i put in low-octane gasoline." "The car pinked when the ignition was too far retarded."

(verb) find fault with; express criticism of; point out real or perceived flaws. Synonyms: knock, criticize, criticise, pick apart. Examples: "The paper criticized the new movie." "Don't knock the food--it's free."