somersault
[ˈsʌmərsɔ:lt]
n.
翻筋斗;
（意见、观点、态度等）180度的转变;
vi.
翻筋斗;
例句:
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Dr Lord...professedly in favor of emancipation, but who afterwards turned a moral somersault.
来自J. G. Whittier
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He did a brilliant backward somersault.
他翻了个漂亮的后翻跟头.
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I turned a somersault on the lawn.
我在草地上翻了个跟头.
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He turned a somersault.
他翻了个筋头.
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He...did a very nice back somersault.
来自Strength Health
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She did a somersault, and heard a slight, mortified intake of breath.
来自NEWYORKER