English

Definition of fail-safe adjective from the Oxford Advanced Learner's Dictionary

 

fail-safe

 adjective
adjective
BrE BrE//ˈfeɪl seɪf//
 
; NAmE NAmE//ˈfeɪl seɪf//
 
[usually before noun]
 
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(of machinery or equipment) designed to stop working if anything goes wrong a fail-safe device/mechanism/system
See the Oxford Advanced American Dictionary entry: fail-safe