HSK 7–9 · noun · verb
锈
rust; to rust; to become rusty
这把刀放久了，上面全是锈。
Zhè bǎ dāo fàng jiǔle， shàngmiàn quán shì xiù。
This knife has been left for a long time and is covered in rust.
山上的老炮已经生锈了。
Shān shàng de lǎo pào yǐjīng shēng xiùle。
The old cannon on the hill has rusted.