brokenarrowとは 意味・読み方・使い方

名詞

broken arrow (複数形 broken arrows)

1. (US, euphemistic, military) An accidental event that involves nuclear weapons or nuclear components but does not create the risk of nuclear war.
   • 2004, Roland Everett Langford, Introduction to Weapons of Mass Destruction: Radiological, Chemical, and Biological, page 97:

     In the US, the code name for a serious nuclear weapons incident is "Broken Arrow". It is US policy neither to confirm nor deny the existence of nuclear weapons at any specific location; this also applies to Broken Arrow incidents.

2. (Can we verify⁽⁺⁾ this sense?) (US, military) a code phrase that a ground unit is facing imminent destruction from enemy attack and all available air forces within range are to provide air support immediately.
   • 2003, Jacques-François de Chaunac, The American Cavalry in Vietnam: "First Cav", ↑ISBN, page 48:

     The FAC urgently sends over his radio a cry for help: "Broken Arrow! Broken Arrow!' His message unleashes all available close air support in South Vietnam on a priority basis.

   • 2008, Terry Ryan, Bring Out Your Dead, ↑ISBN, page 137:

     Before Caras could respond, the General threw down the mike, turned to his second and said, "Get them all the air support we have, everything. This is Broken Arrow"

   • 2010, Danny W. Davis, The Phinehas Priesthood, ↑ISBN:

     Broken Arrow refers to the U.S. military's code word used during the Vietnam War. This call was used only in the direst of tactical situations, when a ground unit was overrun by enemy forces. When “Broken Arrow” was heard on the radio nets, all available aircraft were diverted to provide close air support for the endangered command.

   • 2017, Kevin Ikenberry, Vendetta Protocol, page 155:

     All Pulse elements, this is Home Plate. Broken Arrow. I repeat, Broken Arrow. Forward command of close air-support operations is Rebel Four One.

3. (technical writing) A callout marker that consists of a dashed line with an arrowhead.
   • 2003, Thomas W. Hungerford, Algebra, ↑ISBN, page 371:

     A broken arrow A - - -> B indicates that an occasional result of Section A is used in Section B, but that Section B is essentially independent of Section A.

   • 2012, Diana Gaitini, Musculoskeletal Ultrasound, An Issue of Ultrasound Clinics, ↑ISBN:

     Longitudinal scan of focal thickening and disruption of the median nerve (broken arrow), at the level volar to the distal radius, in keeping with scarring from prior trauma. (F) Sagittal proton density MR image of nonspecific thickening of the 2. 10. 11. 12. 13. 14. 15. 16. 3. 4. median nerve (broken arrow), with a similar configuration.

   • 2014, Richard W. Nelson & ‎C. Guillermo Couto, Small Animal Internal Medicine, ↑ISBN, page 761:

     Note that the uptake of pertechnetate (i.e., darkness) is comparable between the two thyroid lobes (solid arrow) and the salivary glands (broken arrow).

4. Used other than with a figurative or idiomatic meaning: see broken,‎ arrow.