Crossword Genius

Disuse indicator (4)

Ross

I believe the answer is:

rust

(Other definitions for rust that I've seen before include "Reddish-brown coating caused by oxidation" , "Reddish oxide coating on iron" , "deteriorate" , "Fungal disease of plants" , "Reddish-brown coating formed on metal by damp" .)

I've seen this clue in The Wall Street Journal.
Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.