{ } n. [ F. soubresaut a jump, leap, OF. soubresault, It. soprassalto an overleap, fr. L. supra over + saltus a leap, fr. salire to leap; or the French may be from Sp. sobresalto a sudden asault, a surprise. See Supra, and Salient. ] A leap in which a person turns his heels over his head and lights upon his feet; a turning end over end. [ Written also summersault, sommerset, summerset, etc. ] “The vaulter's sombersalts.” Donne. [ 1913 Webster ]

Now I'll only
Make him break his neck in doing a sommerset. Beau. & Fl. [ 1913 Webster ]