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# rust

«rust» in Mova's school dictionary: **the reddish-brown, flaky coating that forms on iron or…** — its meaning for a pupil, its sense in the lessons and examples, with 5 sentences of Mova's corpora that use it.

### part of speech

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

### meaning for a pupil

1) Rust is the reddish-brown, flaky coating that forms on iron or steel when it gets wet and meets air. [tree →](https://md.mova.elamur.ai/free/en/corpora/dictionaries/school/R/rust/#m1)

2) To rust means to become covered with rust. [tree →](https://md.mova.elamur.ai/free/en/corpora/dictionaries/school/R/rust/#m2)

3) Rust is also a reddish-brown colour. [tree →](https://md.mova.elamur.ai/free/en/corpora/dictionaries/school/R/rust/#m3)

### sense 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://md.mova.elamur.ai/free/en/corpora/dictionaries/school/R/rust/#x1)
- Iron rusts when it is left out in the rain. [tree →](https://md.mova.elamur.ai/free/en/corpora/dictionaries/school/R/rust/#x2)
- Paint stops the gate from rusting. [tree →](https://md.mova.elamur.ai/free/en/corpora/dictionaries/school/R/rust/#x3)
- Rust made the metal weak and it broke. [tree →](https://md.mova.elamur.ai/free/en/corpora/dictionaries/school/R/rust/#x4)
- Be careful with rusty nails; they can cut you. [tree →](https://md.mova.elamur.ai/free/en/corpora/dictionaries/school/R/rust/#x5)
- The car had rust on its doors. [tree →](https://md.mova.elamur.ai/free/en/corpora/dictionaries/school/R/rust/#x6)
- Salt water makes metal rust faster. [tree →](https://md.mova.elamur.ai/free/en/corpora/dictionaries/school/R/rust/#x7)
- Gold never rusts. [tree →](https://md.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://md.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.

### In the corpora

- [When atoms change partners, a new substance appears, which is what happens when a nail slowly rusts in water.](https://md.mova.elamur.ai/free/en/corpora/school/chemistry/3-molecules-when-atoms-join-up/3/)
- [Rust forms when iron atoms join with oxygen and water, and a rusted nail weighs more than the clean nail.](https://md.mova.elamur.ai/free/en/corpora/school/chemistry/3-molecules-when-atoms-join-up/20/)
- [That orange stuff is rust, a brand-new substance, not dirt that has landed on the metal.](https://md.mova.elamur.ai/free/en/corpora/school/chemistry/13-rust-irons-slow-fire/1/)
- [Take away either one, the water or the oxygen, and the iron hardly rusts at all.](https://md.mova.elamur.ai/free/en/corpora/school/chemistry/13-rust-irons-slow-fire/3/)
- [In a hand-warmer pack the iron is a fine powder, so it rusts fast enough for you to feel the warmth.](https://md.mova.elamur.ai/free/en/corpora/school/chemistry/13-rust-irons-slow-fire/5/)

### Trees and pragmatics

[Every meaning and example of «rust» parsed by Mova](https://md.mova.elamur.ai/free/en/corpora/dictionaries/school/R/rust/), each sentence with its dependency tree and frames.