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The horizontal piece of wood, stone or metal at the threshold of a doorway; a doorstep.
Open the driver's side door, and shine the flashlight around the doorsill.
This number, usually found on the driver's side doorsill and in the owner's manual, will give you the upper limits of your vehicle's weight capacity.
Doorsill there was none, but a perennial passage for the hens under the door board.