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By typing "sharpen hollow grind" into youtube and google.
As Tigerman eludes to, you can just sharpen flat. You're confusing the grind with the edge. Many production knife markers put a hollow ground because in some ways it's easier to manufacture and the customer doesn't have to remove as much material when sharpening. I honestly dont know of a blade that has a hollow ground edge other than straight razors or reed knifes (for woodwind instruments ). The edge otherwise folds too easily.