- 1proof against something (formal) that can resist the damaging or harmful effects of something The sea wall was not proof against the strength of the waves.
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- 2(in compounds) that can resist or protect against the thing mentioned rainproof/windproof clothing The car has childproof locks on the rear doors. an inflation-proof pension plan prove verb (≠disprove)proof nounproven adjective (≠unproven)
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