Cambridge Dictionaries online Cambridge Dictionaries online

The most popular online dictionary and thesaurus for learners of English

English definition of “rust”


verb [I or T]     /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.Physical and chemical processes
(Definition of rust verb from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
Focus on the pronunciation of rust

Word of the Day


willing to give money, help, kindness, etc., especially more than is usual or expected

Word of the Day


Read our blog about how the English language behaves.

Learn More

New Words

Find words and meanings that have just started to be used in English, and let us know what you think of them.

Learn More