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The act of hitting vigorously
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Negative criticism
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A vigorous blow
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The sound of knocking (as on a door or in an engine or bearing)
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A bad experience
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Find fault with; express criticism of; point out real or perceived flaws
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Knock against with force or violence
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Rap with the knuckles
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Deliver a sharp blow or push
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Make light, repeated taps on a surface
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Sound like a car engine that is firing too early