The term SIGN OF DISUSE is composed of five crossword solutions: DUST, RUST, COBWEB, MOSS, and WEB. DUST is a fine powdery substance made up of tiny particles of earth or waste matter that can accumulate in the air or on surfaces. RUST is an orange-brown discoloration of metal caused by oxidation. COBWEB is a delicate, intricate WEB spun by spiders. MOSS is a small, soft plant that grows in clumps or mats in damp or shady places. WEB is an intricate structure made of threads spun by a spider. All of these words are signs of disuse, as they are all associated with objects that have been left untouched for a long period of time.