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sill noun

  /sɪl/
  • (architecture, also "window sill") A breast wall; window breast; horizontal brink which forms the base of a window.
 davanzale
  • (construction) A threshold; horizontal structural member of a building near ground level on a foundation or pilings, or lying on the ground, and bearing the upright portion of a frame; a sill plate.
 soletta
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