Emily Dickinson Lexicon

SOM'ER-SAULT, or SOM'ER-SET, n. [Sp. sobresalir, to exceed in highth; to leap over; sobresaltar, to surprise; It. soprassalire, to attack unexpectedly; soprassalto, an overleap; L. super and salio, to leap.]

A leap by which a person jumps from a highth, turns over his head and falls upon his feet. – Donne.