a reddish-brown substance that forms on the surface of iron and steel as a result of reacting with air and water

patches of rust 斑斑锈迹

There was an enormous bath with big rust stains.

a reddish-brown colour that looks like rust

any of various plant diseases that cause reddish-brown spots

Rust has infected the wheat fields.

to become or cause something to become covered with rust

Older cars will begin to rust. 旧车将会开始生锈。

Years of being left out in the rain had rusted the metal chairs. 这些铁椅子由于长年在室外淋雨已经生锈了。

The floor of the car had rusted away/through (= been destroyed by rust), so I was careful where I put my feet. 车的底板都锈坏／烂了，所以我放脚时很小心，不能乱踩。