Definition for SILL

SILL, n. [Sax. syl, syle, syll; Fr. seuil; G. schwelle; W. sail, syl or seiler, foundation; seiliaw, to found; L. solum, allied to solid. The primary sense is probably to lay, sat, or throw down.]

  1. Properly, the basis or foundation of a thing; appropriately, a piece of timber on which a building rests; the lowest timber of any structure; as, the sills of a house, of a bridge, of a loom, and the like.
  2. The timber or stone at the foot of a door; the threshhold.
  3. The timber or stone on which a window frame stands; the lowest piece in a window frame.
  4. The shaft or thill of a carriage. [Local.] – Grose.

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