Definition: the sound of knocking (as on a door or in an engine or bearing); "the knocking grew louder"
Definition: a vigorous blow; "the sudden knock floored him"; "he took a bash right in his face"; "he got a bang on the head"
Definition: a bad experience; "the school of hard knocks"
Definition: An abrupt rapping sound, as from an impact of a hard object against wood.
Definition: deliver a sharp blow or push; "He knocked the glass clear across the room"
Definition: rap with the knuckles; "knock on the door"
Definition: make light, repeated taps on a surface; "he was tapping his fingers on the table impatiently"
Definition: 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"
Definition: 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"
Definition: To strike for admittance; to rap upon, as a door.