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fail-safe

adjective
 
 
/ˈfeɪ.l.seɪf/

Definition

very unlikely to fail: a fail-safe planEasiness 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 deviceSafe and secure
(Definition of fail-safe adjective from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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