It's pretty much impossible to explain aerodynamics without heavily simplifying it. Aerodynamics is a field for engineers, based on differential equations that don't have much use in the cockpit.
So, when someone says ground effect is a "cushion of air," or airflow speeds up across the top of a wing because the "molecules flowing across the top and bottom have to meet up at the trailing edge" - they're really not hurting anyone, right?
How about this: When you're flying at or below maneuvering speed, you'll "stall before you break." Sound familiar?...
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