From Longman Dictionary of Contemporary Englishsillsill /sɪl/ noun [countable] 1 DHHthe narrow shelf at the base of a window frame2 TTCthe part of a car frame at the bottom of the doors
Examples from the Corpus
sill• Things are sill being sorted out.• These barn sills enclose thick white birch, ash, and maple trees.• Cut magnetic seal to length and insert into the slot in the drainage sill.• Outside, a wood dove burbled on my sill.• In the morning white rime coated the sill of the barred window-space.• Front and rear valances also bolt on, but are more costly than the sills to replace.• I reached under the sill, lifted it, and spread the curtains.• The sides, or jambs, must also be straight, plumb and square with the sill.Origin sill Old English syll 