I.
noun
VERB + RUST
▪ get off , remove , scrape off
RUST + NOUN
▪ spot , stain
▪ remover
▪ belt (= a region where many factories have closed) ( esp. AmE )
PHRASES
▪ covered with ~
▪
The lock was covered with ~.
II.
verb
ADVERB
▪ badly
▪ away , through
▪
The car had been ~ing away in his garage for years.
Rust is used with these nouns as the subject: ↑ iron , ↑ metal