sill [sills](base of a window) noun [UK: sɪl] [US: ˈsɪl]
windowsill(the horizontal member protruding from the base of a window frame) noun [UK: ˈwɪn.dəʊ.sɪl] [US: ˈwɪndo.ʊ.sɪl]A pretty robin landed on my room's windowsill. = Un petirrojo bonito se posó en el antepecho de mi dormitorio.