n 1: the sound of knocking (as on a door or in an engine or
bearing); "the knocking grew louder" [syn: knocking
2: negative criticism [syn: roast
3: a vigorous blow; "the sudden knock floored him"; "he took a
bash right in his face"; "he got a bang on the head" [syn:
4: a bad experience; "the school of hard knocks"
5: the act of hitting vigorously; "he gave the table a whack"
v 1: deliver a sharp blow or push :"He knocked the glass clear
across the room." [syn: strike hard
2: rap with the knuckles; "knock on the door"
3: knock against with force or violence; "My car bumped into
the tree" [syn: bump
4: make light, repeated taps on a surface; "he was tapping his
fingers on the table impatiently" [syn: tap
5: of car engines, when firing too early [syn: ping