"Most of what you're saying is technically correct, but i think you've not grasped the point i'm making, which is about the use of English, not the laws of physics. I'll make the point again. When you say "the weight is over your foot" Or "your weight is over your foot" it is usually understood to mean that the body's centre of mass is over the foot. That's the main point i'm making"
And the point of this thread was to point out that this is exactly what I mean by using the word "over"
In contrast, when I use the word "on" or "in", I mean that the weight, which is really to say the force due to gravity and acceleartion acting on the center of mass, is producing a pressure in the foot. The difference is that this does not necessarily mean that the center of mass is over the foot - in most cases where there is acceleration, in fact most of the time it will mean that the center of mass is NOT over the supporting foot.
In terms of the vertical acceleration of fall lessing your apparent weight, I agree, but would take it further. Championship dancers will fall much more than 6 inches, and so will "weigh" substantially less as they are accelerating downwards to cover this greater distance.
But the flip side of that is that while you weigh less while your downwards speed is increasing, you will weight MORE while your downwards speed is decreasing, which is to say when you start transitioning your movement from vertical to horizontal. At the bottom of the curve, your weight will be substantially more than your static body weight - and again, by a greater factor for championship lowering than it would be for relaxed social movement.
(A championship dancer probably would have a more gradual transition from vertical to horizontal movement though - they aren't going to drop in place and only then move, they will start moving even as they drop)