rust
Pronunciation: [rʌst]
Word
Context: “materials”
(noun) rust is a reddish-brown substance that forms on metal when it gets wet and is exposed to air. It happens when metal, like iron, reacts with oxygen and water, and it can make the metal weak.
Example
The old bicycle had a little rust on it, but it still worked fine.
Example
The tools were covered in rust and could no longer be used safely.
Example
What causes rust to form on metal surfaces?
Context: “materials”
(verb) to rust means to get that reddish-brown substance on metal. It happens when metal is left outside too long and doesn't stay dry.
Example
The bike didn't rust because it was kept in the garage.
Example
The iron gate rusted after being exposed to rain for weeks.
Example
Are the tools rusting if I leave them outside?
Context: “deterioration”
(verb) to rust can also mean to become old and unused, like when skills or abilities fade away because they are not practiced.
Example
She practices playing the piano every day so her skills don’t rust.
Example
His math skills rusted since he didn't practice them for years.
Example
How can you prevent your language skills from rusting?
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