Win too much for too long, and folks will try to knock you down.

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Dogs express their love and trust in many ways -- some lap at your face, knock you down with kisses as you come home, leave a half-dead animal on your pillow, or sit on your lap and sigh with contentment.

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Blimey, you could knock me down with a wet haddock there.

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What you have done is create an argument that neither of the voices you cited actually hold and then try to knock it down.

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You can knock one of these nuclei from up to down by bathing it in radio waves of a particular frequency (exactly which frequency depends on the element).

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You can come down, make phone calls, knock on doors.

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