summersault
  翻S斗
  Som·er·sault Som·er·set n.  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.”
  Now I'll only
  Make him break his neck in doing a sommerset.   --Beau. & Fl.
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  Sum·mer·sault Sum·mer·set n. See Somersault, Somerset.
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