a reddish- or yellowish-brown flaking coating of iron oxide that is formed on iron or steel by oxidation, especially in the presence of moisture
paint protects your car from rust
the MPs are here to scrape the rust off the derelict machinery of government
a fungal disease of plants which results in reddish or brownish patches.
a reddish-brown colour
her rust-coloured coat
be affected with rust
the blades had rusted away