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[ US /feɪɫˈsæf/ ]
ADJECTIVE
  1. guaranteed not to fail
    a fail-safe recipe for cheese souffle
  2. 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
NOUN
  1. a mechanism capable of returning to a safe state in case there is a failure or malfunction

How To Use fail-safe In A Sentence

  • From being an overlooked, conservative fail-safe, it's shot up near the top of the list of summer desirables.
  • Many shooters don't understand the purpose of such a dual action, assuming that the pump mechanism is a fail-safe against a malfunction with the semiauto mode.
  • The big important systems such as atmosphere, food, environmental, navigation, and drill were protected with so many back-ups and fail-safes that it was almost impossible for them to freeze.
  • For the uninitiated, most ground forces still employ a final fail-safe method for testing the air before giving the ‘all clear’ message to soldiers wearing their gas masks.
  • This is your fail-safe guide to the season's starriest looks. Times, Sunday Times
  • It's pretty fail-safe, but you still have to pay attention to what you're doing.
  • Now, the team from Hull University is setting out to create a fail-safe detection mechanism for the placement of feeding tubes that is reliable and cheap to manufacture.
  • Eyewear of the appropriate optical density is worn when using devices not equipped with fail-safe mechanisms.
  • A fail-safe system triggered a red signal, giving the driver of the train time to stop and remove the obstacle.
  • The good news is that having your teeth professionally whitened is not only affordable, which should last a lifetime with occasional top-ups - it is also a simple, noninvasive and virtually fail-safe procedure.
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