gather rust

Translations
покрываться ржавчиной
The old bicycle was left outside to gather rust.
Старый велосипед оставили на улице, и он покрылся ржавчиной.
Definitions
To collect or accumulate rust, which is the reddish-brown oxide formed on iron or steel due to oxidation, often as a result of exposure to moisture and air.
Words
gather

verb
собирать
rust

noun
ржавчина