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.
The Japanese equivalent of a sash, obi, serves to hold a kimono or yukata together. Honorific orders. Sashes are indicative of holding the class of Grand Cross or Grand Cordon in a chivalric order or an order of merit. The sash is usually worn from the right shoulder to the left hip.