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Jesus nut

(slang, metaphorical) A single point of failure with catastrophic consequences.

ˈd͡ʒizəs ˈnʌt200 viewsLast reviewed Jun 29, 2026+ Add a definition
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#1·Apr 27, 2026

(slang, metaphorical) A single point of failure with catastrophic consequences.

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#2·Apr 27, 2026

(aviation, slang) The nut that holds the main rotor to the mast of some helicopters.

Origin: Possibly from the Vietnam War. From the notion that, given its critical function, if the nut were to fail, the only thing left to do would be to "pray to Jesus". Origin information sourced from Wiktionary contributors (CC BY-SA 4.0).
For parents

"Jesus nut" means: The nut that holds the main rotor to the mast of some helicopters.. This is informal slang, common in casual speech, texting and social media, but not appropriate for school work, applications or professional settings. There is no real cause for concern in itself; it is everyday peer vocabulary. If your child uses it, a light comment about audience and register is usually enough — no need to escalate. Context, more than the word, tells you whether to follow up.

For ESL learners

"Jesus nut" means: The nut that holds the main rotor to the mast of some helicopters.. Register: informal slang, fine in casual conversation, texting and social media but not in academic essays, business writing or formal speech. A common non-native mistake is to use the word in the wrong register, or to assume one fixed meaning when it is actually polysemous; always check the surrounding register and the audience before producing it yourself. In formal writing, prefer a neutral synonym or a short descriptive phrase, and use this word only when you have heard or read it being used naturally in a comparable context.

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