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The Collaborative International Dictionary
summersault

Somersault \Som"er*sault\, Somerset \Som"er*set\, 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.

Now I'll only Make him break his neck in doing a sommerset.
--Beau. & Fl.

Wiktionary
summersault

n. (archaic spelling of somersault English)

Wikipedia
Summersault
This page is about the 1998 and 2000 Canadian music festivals. For the gymastic feat, see Somersault. For the 1995 Australian festival of the same name, see Summersault (Australian festival).

Summersault was a Canadian music festival organized by the band Our Lady Peace in 1998 and again in 2000. Summersault 1998 was held in Barrie, Ontario, at Molson Park, St. John's, NL and Shediac's | Centre for Speed in NB while Summersault 2000 toured to eight Canadian cities.

Summersault (Australian festival)

Summersault was a music festival put on by promoter Steve Pavlovic that toured Australia in the summer of 1995/1996.

Usage examples of "summersault".

Spink headed back to Frankfurt, Ebby and SUMMERSAULT circled each other cautiously.

When Henry got home he found her naked, doing jumps, twirls and summersaults, the routine she'd learned way back when.

However I made sure not to watch as he did three summersaults in the air and landed on his feet.