(~s, ~ing, ~ed)
1.
Rust is a brown substance that forms on iron or steel, for example when it comes into contact with water.
...a decaying tractor, red with ~...
N-UNCOUNT
2.
When a metal object ~s, it becomes covered in ~ and often loses its strength.
Copper nails are better than iron nails because the iron ~s...
VERB: V
3.
Rust is sometimes used to describe things that are reddish-brown in colour.
...turquoise woodwork with accent colours of ~ and ochre.
COLOUR