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.
â a heavy textile with a woven design; used for curtains and upholstery 1. the tapestry; the tapis. â a heavy textile with a woven design; used for curtains and upholstery 1. tapestry [the ~] noun. tapis [the ~] noun.