If gold ruste, what shall iron do? --Chaucer.
Our armors now may rust. --Dryden.
2. To be affected with the parasitic fungus called rust;
also, to acquire a rusty appearance. as plants.
3. Fig.: To degenerate in idleness; to become dull or
impaired by inaction.
Must I rust in Egypt? never more Appear in arms, and
be the chief of Greece? --Dryden.