Jesus nut
English
editEtymology
editPossibly 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".
Noun
editJesus nut (plural Jesus nuts)
- (aviation, slang) The nut that holds the main rotor to the mast of some helicopters.
- (slang, figurative) A single point of failure with catastrophic consequences.