said by cdru:They don't generally call those dried up manufacturing states and mining states the "RUST BELT" for nothing.. incumbent industries "SUCK" all the lifeblood out of a geography until it's stone dry and then leave with all the profits... As long as gullible customers think that's okay and keep paying monthly fees to Verizon and do nothing about it.. while elsewhere touting the alleged fastest broadband in the country (erroneously) is the A list of hypocrisy
The most common definition for rust is iron oxide, but can also mean corrosion on other metals other than iron. As a verb, it can also mean to degenerate with the passage of time with no mention specifically to iron. As an adjective, it can mean inept and slow through lack of practice or old age.
All 3 of those alternate definitions could apply to "rusting copper" although oxidizing, corroding, or more generically deteriorating copper probably would have been better.