fail-safe

adjective
🔊/ˈfeɪl seɪf/
🔊/ˈfeɪl seɪf/
[usually before noun]
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  1. (of machinery or equipment机器或设备) designed to stop working if anything goes wrong有自动保险装置的;具有自动防止故障性能的
    • a fail-safe device/mechanism/system故障保护装置/机械装置/系统