rust
nounUK /rʌst/
US /rʌst/
A red-brown coating that forms on iron when it gets wet.
The old bike was covered in rust.
OTHER MEANINGS
2. A plant disease that causes reddish-brown spots on leaves.
The wheat crop was damaged by rust.
3. A reddish-brown color.
She painted the fence a warm rust.
4. To become covered with rust.
The gate will rust if left in the rain.