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Not sideways, as it will cut you. It is more like forward & sideways, much like a diagonal. If you watch how chefs cut vegetables, they push the knife forward and down at the same time as well. ...

I'd say sharpness & utilize a scything motion. Remember, straight razors are slicing implemenets. They can cut straight on as a push cutter, but a little forward & down slicing action like a scythe...