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English definition of “fail-safe”

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fail-safe

adjective uk   /ˈfeɪ.l.seɪf/ us  
very unlikely to fail: a fail-safe plan If something is fail-safe, it has been designed so that if one part of it does not work, the whole thing does not become dangerous: a fail-safe device
(Definition of fail-safe from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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