A device, mechanism or measure designed to make something fail-safe.

That does not cause undue damage in the event of failure. / Designed to shut off for safety if an emergency occurs.

To compensate automatically, in the event of a failure. / To make a device or mechanism fail-safe, or to add a fail-safe device or mechanism to an existing system.

(computing) To automatically switch processing from a failed component in a critical system to its live spare or backup component.

Of a device: such that, if it fails, it does so in a way that will cause little or no harm to other devices and personnel.

simple past tense and past participle of fail at life

present participle of fail at life

(Internet slang) To be or become trapped in poverty, or in a situation where someone is not doing anything productive with their lives; to become a loser.

(UK, slang, derogatory) The Daily Mail newspaper.

Third-person singular simple present indicative form of fail-safe