noun, verb
noun [U]
1 a reddish-brown substance that is formed on some metals by the action of water and air:
pipes covered with rust * rust spots * a rust-coloured dress
seealsoRUSTY
2 a plant disease that causes reddish-brown spots; the FUNGUS that causes this disease
verb if metal rusts or sth rusts it, it becomes covered with rust:
[V] old rusting farming implements * Brass doesn't rust. * The floor of the car had rusted through. * [VN] Water had got in and rusted the engine.
rusted adjective:
rusted iron
seealsoRUSTY
PHRASALVERBS
rust away to be gradually destroyed by rust:
There was an old bike rusting away outside.
