...Some fly round with the flock, throwing a clean summersault every few yards, till they are obliged to settle from giddiness and exhaustion...
Charles Darwin 「The Variation of Animals and Plants Under Domestication, Vol. I.」
...My lord Yvain gave him such a mighty blow that Kay took a summersault from out of his saddle and struck with his helmet on the ground...
Chretien DeTroyes 「Four Arthurian Romances」
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