Meaning of “rust” in the English Dictionary

"rust" in British English

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rustnoun [ U ]

uk /rʌst/ us /rʌst/

a reddish-brown substance that forms on the surface of iron and steel as a result of reacting with air and water:

patches of rust

a reddish-brown colour that looks like rust

any of various plant diseases that cause reddish-brown spots

rust
adjective uk us

having a reddish-brown colour

rustverb [ I or T ]

uk /rʌst/ us /rʌst/

to become or cause something to become covered with rust:

Older cars will begin to rust.
Years of being left out in the rain had rusted the metal chairs.
The floor of the car had rusted away/through (= been destroyed by rust), so I was careful where I put my feet.

(Definition of “rust” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"rust" in American English

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rustnoun [ U ]

us /rʌst/

a red-brown substance that forms on the surface of iron and steel as a result of decay caused by reacting with air and water

rust
verb [ I/T ] us /rʌst/

[ I ] Stainless steel won’t rust.

(Definition of “rust” from the Cambridge Academic Content Dictionary © Cambridge University Press)