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/sɪl/ · noun
(architecture, also "window sill") A breast wall; window breast; horizontal brink which forms the base of a window..
She looked out the window resting her elbows on the window sill.
Minor palingenetic magmas probably were generated at this time and intruded the mantling rocks in the form of small sills and apophyses […].
The molten rock in the sills may have ignited vast reserves of shallowly buried natural gas, much like a match applied to a gas barbecue.
the nasal sill
Use sill when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Sill means (architecture, also "window sill") A breast wall; window breast; horizontal brink which forms the base of a window..
The closest synonym depends on the sentence and intended sense.
The opposite depends on the specific sense.
She looked out the window resting her elbows on the window sill.
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