[noun] a vigorous blow; "the sudden knock floored him"; "he took a bash right in his face"; "he got a bang on the head" Synonyms:bash, bang, smash, belt
[noun] a bad experience; "the school of hard knocks"
[noun] the act of hitting vigorously; "he gave the table a whack" Synonyms:belt, rap, whack, whang
[verb] deliver a sharp blow or push :"He knocked the glass clear across the room" Synonyms:strike hard
[verb] rap with the knuckles; "knock on the door"
[verb] knock against with force or violence; "My car bumped into the tree" Synonyms:bump
[verb] make light, repeated taps on a surface; "he was tapping his fingers on the table impatiently" Synonyms:tap, rap, pink
[verb] 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" Synonyms:pink, ping
[verb] find fault with; express criticism of; point out real or perceived flaws; "The paper criticized the new movie"; "Don't knock the food Synonyms:criticize, criticise, pick apart