fail-safe /ˈfeɪlˌseɪf/ adjective Learner's definition of FAIL-SAFE
[more fail-safe; most fail-safe]
: certain not to fail万无一失的 -
Of course, no system is entirely fail-safe.当然，没有什么体系是万全的。
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He was looking for a fail-safe source of money.他在寻找一个万全的资金来源。
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a fail-safe device/mechanism [=a device/mechanism that will not break]自动防护装置/机械装置