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fail-safe

[ feyl-seyf ]
/ ˈfeɪlˌseɪf /
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adjective
noun
(sometimes initial capital letter) the point beyond which the bombers cannot go without specific instruction; the fail-safe point.
something designed to work or function automatically to prevent breakdown of a mechanism, system, or the like.
verb (used with object), fail-safed, fail-saf·ing.
to make fail-safe.
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Origin of fail-safe

First recorded in 1945–50; apparently from verb phrase to fail safe(ly)
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2022

British Dictionary definitions for fail-safe

fail-safe

adjective
designed to return to a safe condition in the event of a failure or malfunction
(of a nuclear weapon) capable of being deactivated in the event of a failure or accident
unlikely to fail; foolproof
verb
(intr) to return to a safe condition in the event of a failure or malfunction
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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