英语翻译He lifts the dog up and swings him around over his head

英语翻译
He lifts the dog up and swings him around over his head by the tail.
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就是这一句,请翻译得准确一点,那些看不懂的中文是不会采纳的.
这句话我基本上看懂了，就是不知道swings him around by the tail是怎么一回事，具体的动作是怎样做的。