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English definition of “-proof”

-proof

suffix     /-pruːf/
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)
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