Meaning of knock

Definition of knock

(noun) the sound of knocking (as on a door or in an engine or bearing); "the knocking grew louder"
a vigorous blow; "the sudden knock floored him"; "he took a bash right in his face"; "he got a bang on the head"
a bad experience; "the school of hard knocks"
the act of hitting vigorously; "he gave the table a whack"
(verb) deliver a sharp blow or push; "He knocked the glass clear across the room"
rap with the knuckles; "knock on the door"
knock against with force or violence; "My car bumped into the tree"
make light, repeated taps on a surface; "he was tapping his fingers on the table impatiently"
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"
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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