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fail-safe

1 of 2

adjective

1
: incorporating some feature for automatically counteracting the effect of an anticipated possible source of failure
2
: being or relating to a safeguard that prevents continuing on a bombing mission according to a preconceived plan
3
: having no chance of failure : infallibly problem-free
the little black dress … has consistently been the fail-safe solution for night Vogue

fail-safe

2 of 2

noun

: a device or measure that makes something fail-safe

Word History

First Known Use

Adjective

1931, in the meaning defined at sense 1

Noun

1975, in the meaning defined above

Time Traveler
The first known use of fail-safe was in 1931

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