A dangerous and daring jump with possibly lethal outcome. puhekieltä A risky, dangerous or crucial step or undertaking.
1867 July, (w), “At Padua” in w:The Atlantic|The Atlantic Monthly: A Magazine of Literature, Science, Art, and Politics, volume XX, № CXVII, chapter i, page (gbooks):
1919, (w), s:The Source and Aim of Human Progress|The Source and Aim of Human Progress:
The frenzied, suggestible, gregarious, subconscious self, freed from all rational restraints, celebrated its delirious orgies, its corybantic bacchanalia, held its mad salto mortale over the grave of crucified humanity.