S: (n) knock, bash, bang, smash, belt (a vigorous blow) "the sudden knock floored him"; "he took a bash right in his face"; "he got a bang on the head"
S: (n) knock (a bad experience) "the school of hard knocks"
S: (n) knock, belt, rap, whack, whang (the act of hitting vigorously) "he gave the table a whack"
Verb
S: (v) knock, strike hard (deliver a sharp blow or push) "He knocked the glass clear across the room"
S: (v) knock (rap with the knuckles) "knock on the door"
S: (v) bump, knock (knock against with force or violence) "My car bumped into the tree"
S: (v) tap, rap, knock, pink (make light, repeated taps on a surface) "he was tapping his fingers on the table impatiently"
S: (v) 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"
S: (v) 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--it's free"