fail closed

Fetched 2026-10-26 (cache).

Datamuse reports no synonyms or antonyms for this word.

Verb

1. {{lb|en|cybersecurity}} Of an [[access control#Noun|access control]] [[system#Noun|system]]: to automatically block all [[traffic#Noun|traffic]] in the case of a failure. For example, an electronic [[safe#Noun|safe]] becoming impossible to unlock in the event of a [[power outage#Noun|power outage]].

Source: Wiktionary · CC BY-SA 4.0 (Wiktionary dump) · cached copy, not a rewrite.