Properly, the basis of foundationof a thing; appropriately, a piece of timber on which a building rests; the lowest timber of any stucture; as the sills of a house, of a bridge, of a loom and the like.

The timber or stone at the foot of a door; the threshhold.

The timber or stone on which a window frame stands; or the lowest piece in a window frame.

The shaft or thill of a carriage.