sill [sills](base of a window) noun [UK: sɪl] [US: ˈsɪl]John painted the window sills white. = John ha dipinto di bianco i davanzali delle finestre.
windowsill(the horizontal member protruding from the base of a window frame) noun [UK: ˈwɪn.dəʊ.sɪl] [US: ˈwɪndo.ʊ.sɪl]Where is my cactus? On the windowsill. = Dov'è il mio cactus? Sul davanzale.