rust

1. N-UNCOUNT Rust is a brown substance that forms on iron or steel, for example when it comes into contact with water. 锈

...a decaying tractor, red with rust. …一辆腐朽的拖拉机，因生锈而呈红色。

2. V-I When a metal object rusts, it becomes covered in rust and often loses its strength. 生锈

Copper nails are better than iron nails because the iron rusts. 铜钉比铁钉好，因为铁钉会生锈。

3. COLOR Rust is sometimes used to describe things that are reddish brown in colour. 铁锈色 (的)

...rust and gold leaves from the maples. …铁锈色和金黄色相间的枫叶。