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Definition of Broken arrow
1. Noun. (US euphemistic) (alternative spelling of broken arrow nodot=1), a nuclear accident. ¹
2. Noun. (US euphemistic) (military) An accidental event that involves nuclear weapons or nuclear components but does not create the risk of nuclear war. ¹
3. Noun. (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. ¹
¹ Source: wiktionary.com