som·er·sault also sum·mer·sault 
(sŭmər-sôlt′)
(sŭmər-sôlt′)n.
1. An acrobatic stunt in which the body rolls forward or backward in a complete revolution with the knees bent and the feet coming over the head. Also called somerset; also called regionally tumbleset.
2. A complete reversal, as of sympathies or opinions.
intr.v. som·er·sault·ed, som·er·sault·ing, som·er·saults also sum·mer·sault·ed or sum·mer·sault·ing or sum·mer·saults
To execute a somersault.
[Obsolete French sombresault, variant of sobresault, from Old Provençal sobresaut : sobre-, above (from Latin suprā; see uper in the Appendix of Indo-European roots) + saut, leap (from Latin saltus, from past participle of salīre, to leap; see sel- in the Appendix of Indo-European roots).]