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fail closed
From Wiktionary, the free dictionary
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English
Verb
fail closed (third-person singular simple present fails closed, present participle failing closed, simple past and past participle failed closed)
- (cybersecurity) Of an access control system: to automatically block all traffic in the case of a failure. For example, an electronic safe becoming impossible to unlock in the event of a power outage.
- Coordinate term: fail open
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