Not too happy with you using autism to call someone dumb, but I'll leave this up assuming it was just a one-off.
Definition of sash for Students. 1  1 : a frame for a pane of glass in a door or window. 2  2 : the movable part of a window.
(ËwÉªn doÊ) n. 1. an opening in the wall of a building, the side of a vehicle, etc., for the admission of air or light, or both, commonly fitted with a frame in which are set movable sashes containing panes of glass. 2. such an opening with the frame, sashes, and panes of glass or any other device by which it is closed. 3. a windowpane. 4. a framed or bracketed opening in a wall, above a counter, etc., where some service or product may be obtained, as in a bank or post office.