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.
towel. n. 1. a square or rectangular piece of absorbent cloth or paper used for drying the body. 2. a similar piece of cloth used for drying plates, cutlery, etc. 3. (Boxing) throw in the towel See throw in 4.