Cambridge Dictionaries online Cambridge Dictionaries online

The most popular online dictionary and thesaurus for learners of English

  

-proof

suffix
 
 
/-pruːf/

Definition

protecting against, or not damaged by, a particular thing: a bullet-proof vest a waterproof/wind-proof jacket frost-proof pots for the gardenDefending and protectingBacking, supporting and defendingPreserving and saving
(Definition of -proof suffix from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

“-proof” in other dictionaries

Word of the Day

be under a cloud

to not be trusted or popular because people think you have done something bad

Word of the Day

Blog

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