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.
This is the official local sash for the Miss America Outstanding Teen Program. This handmade sash has the Miss America Outstanding Teen logo on the upper shoulder with monogrammed title embroidered down the front of the sash. The sash is made from 100% Japanese Satin to ensure the best quality possible.