Definition of fail-safe
English to English noun - a mechanism capable of returning to a safe state in case there is a failure or malfunction
source: WordNet 3.0 adjective satellite - guaranteed not to fail
A fail-safe recipe for cheese souffle.
source: WordNet 3.0 - eliminating danger by compensating automatically for a failure or malfunction
A fail-safe device in a nuclear weapon to deactivate it automatically in the event of accident.
source: WordNet 3.0
Visual Synonyms 
Nearby Word
fail-safe, falsify, foolscap, flake off, flag-ship, fool's cap, fluxive, flagship, flexible, flexibility, felicify, fellowship
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