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# rust

noun (rust — uncountable); verb (rust, rusts, rusted, rusting)

«rust» in the English dictionary: everyday — its meanings, how the lessons use it, and examples, each with its tree on Mova.

## Everyday

1. Rust is the reddish-brown, flaky coating that forms on iron or steel when it gets wet and meets air. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/R/rust/#m1)
2. To rust means to become covered with rust. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/R/rust/#m2)
3. Rust is also a reddish-brown colour. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/R/rust/#m3)

### In the lessons

In science rust is a chemical change: iron reacts with oxygen and water, so it is a classic example of a change you cannot undo. In everyday life it makes bikes, nails and gates weak; paint and oil stop it. Phrases: «rust away», «covered in rust», «rust-proof», «rusty».

### Examples

- My old bike chain is covered in rust. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/R/rust/#x1)
- Iron rusts when it is left out in the rain. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/R/rust/#x2)
- Paint stops the gate from rusting. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/R/rust/#x3)
- Rust made the metal weak and it broke. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/R/rust/#x4)
- Be careful with rusty nails; they can cut you. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/R/rust/#x5)
- The car had rust on its doors. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/R/rust/#x6)
- Salt water makes metal rust faster. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/R/rust/#x7)
- Gold never rusts. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/R/rust/#x8)
- Others polished the blade until all the rust was removed and it glistened like burnished silver. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/R/rust/#x9)

### Note

Uncountable: some rust, not «a rust». Adjective: rusty. Only iron and steel truly rust; other metals tarnish or corrode. Safety: a cut from a rusty nail needs cleaning and maybe a tetanus shot — the danger is germs (tetanus), not the rust itself.

## On Mova

- [Trees and pragmatics of «rust» in the school dictionary](https://mova.elamur.ai/free/en/corpora/dictionaries/school/R/rust/): every meaning and example parsed by Mova, with its dependency tree and frames.
- [«rust» in the school dictionary](https://mova.elamur.ai/free/en/dictionaries/school/w/rust.html) on Mova free.