Cambridge Dictionaries online Cambridge Dictionaries online

The most popular online dictionary and thesaurus for learners of English

English definition of “rust”

See all translations

rust

noun [U] uk   /rʌst/ us  
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

rust

verb [I or T] uk   /rʌst/ us  
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.
Translations of “rust”
in Korean 녹…
in Arabic صَدَأ…
in French rouille…
in Turkish pas…
in Italian ruggine…
in Chinese (Traditional) 鏽, 鐵銹, 鐵銹色…
in Russian ржавчина…
in Polish rdza…
in Spanish óxido…
in Portuguese ferrugem…
in German der Rost…
in Catalan rovell…
in Japanese (金属の)さび…
in Chinese (Simplified) 锈, 铁锈, 铁锈色…
(Definition of rust from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
What is the pronunciation of rust?
Add Cambridge dictionaries to your browser to your website

Definitions of “rust” in other dictionaries

Word of the Day

christmassy

typical of Christmas, or happy because it is Christmas

Word of the Day

Cleavage proves divisive in Cambridge’s words of 2014

by Alastair Horne,
December 19, 2014
​​​​ Other dictionaries may choose faddish novelties as their words of the year, but here at Cambridge, we like to do something different. We look for the words that have seen sudden surges in searches over the course of the year – words that have been baffling users of English and driven them

Read More 

tweleb noun

December 22, 2014
informal a Twitter celebrity; (more specifically, someone who has more than 1,000 followers on Twitter) There were a few old and a few new faces, including a tweleb or two. Expect to see and hear more from these cool kids.

Read More