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Webster Dictionary (0.00 / 0 votes) Rate this definition: Sash (noun) a scarf or band worn about the waist, over the shoulder, or otherwise; a belt; a girdle, -- worn by women and children as an ornament; also worn as a badge of distinction by military officers, members of societies, etc. Sash (verb) to adorn with a sash or scarf. Sash (noun)
The moveable part of a window made up of the vertical and horizontal frame that holds the glass. On a double-hung window, the part where the bottom part of the upper sash and the upper part of the lower sash come in contact. Also known as the middle of the window. A framed sheet of glass within a window frame. The horizontal piece of a window sash â comprised of the lower rail and upper rail.