5. (verb)rust, rusty, rust-brown of the browncolor of rust
6. (verb)corrode, rust become destroyed by water, air, or a corrosive such as an acid "The metal corroded"; "The pipes rusted"
7. (verb)corrode, eat, rust cause to deteriorate due to the action of water, air, or an acid "The acid corroded the metal"; "The steady dripping of water rusted the metal stopper in the sink"