Sill

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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.
(n.) The shaft or thill of a carriage.
(n.) A young herring.