fail-safe
1fail–safe
adj \ˈfāl-ˌsāf\Definition of FAIL-SAFE
1
: incorporating some feature for automatically counteracting the effect of an anticipated possible source of failure
2
: being or relating to a safeguard that prevents continuing on a bombing mission according to a preconceived plan
3
: having no chance of failure : infallibly problem-free <the little black dress … has consistently been the fail–safe solution for night — Vogue>
See First Known Use of FAIL-SAFE
1946
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