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.
1 A replacement vinyl sash can cost $40-$250 or more, depending on size, type and brand. 2  Replacing a broken pane of glass can be a relatively straightforward do-it-yourself project, and is easiest with wood-framed windows and single-pane glass.