fail-safe

Noun
  1. A mechanism capable of returning to a safe state in case there is a failure or malfunction (synset 103322935)
    is a type of: mechanism - device consisting of a piece of machinery; has moving parts that perform some function
Adjective
  1. Guaranteed not to fail (synset 302101794)
    "a fail-safe recipe for cheese souffle"
    similar to: secure - free from danger or risk
  2. Eliminating danger by compensating automatically for a failure or malfunction (synset 302065552)
    "a fail-safe device in a nuclear weapon to deactivate it automatically in the event of accident"
    similar to: safe - free from danger or the risk of harm

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