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English definition of “fail-safe”

fail-safe

adjective     /ˈfeɪ.l.seɪf/
very unlikely to fail : a fail-safe plan Easiness and simplicity 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 Safe and secure
(Definition of fail-safe adjective from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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