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Definition of sill noun from the Oxford Advanced Learner's Dictionary

sill

noun
 
/sɪl/
 
/sɪl/
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  1. (also windowsill, window ledge)
    a narrow shelf below a window, either inside or outside
  2. a piece of metal that forms part of the frame of a vehicle below the doors
  3. Word OriginOld English syll, sylle ‘horizontal beam forming a foundation’, of Germanic origin; related to German Schwelle ‘threshold’.
See sill in the Oxford Advanced American Dictionary

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