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- DictionaryFail-safe/ˈfāl ˌsāf/
adjective
- 1. causing a piece of machinery or other mechanism to revert to a safe condition in the event of a breakdown or malfunction: "a forklift with a fail-safe device"
noun
- 1. a system or plan that comes into operation in the event of something going wrong or that is there to prevent such an occurrence: "the secondary safety system is indeed a fail-safe"