Dictionary

n.
1.the sound of knocking (as on a door or in an engine or bearing)
2.negative criticism
3.a vigorous blow
4.a bad experience
5.the act of hitting vigorously knock v.
1.deliver a sharp blow or push :"He knocked the glass clear across the room"
2.rap with the knuckles
3.knock against with force or violence
4.make light, repeated taps on a surface
5.sound like a car engine that is firing too early
6.find fault with

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