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Meaning Of Sill
n.
The basis or foundation of a thing; especially, a horizontal
piece, as a timber, which forms the lower member of a frame, or
supports a structure; as, the sills of a house, of a bridge, of a loom,
and the like.
n.
The timber or stone at the foot of a door; the threshold.
n.
The timber or stone on which a window frame stands; or, the
lowest piece in a window frame.
n.
The floor of a gallery or passage in a mine.
n.
A piece of timber across the bottom of a canal lock for the
gates to shut against.