She leads a second horse, an old sway-backed mare.

她牵着另一匹马，一匹摇摇晃晃的老母马 。

youdao

Over the next ten minutes it exhaled, deflating into what I can only describe as a compact, sway-backed, brick of chocolate-fudge.

大概十分钟以后，它开始收缩，缩成了一个小型的，凹凸不平的，砖状的巧克力软糖。

youdao

Sway-backed mules are loaded with boxes and led two abreast along the road.

BBC: Apple harvest in the Himalayan foothills

It was the two-lane U.S. Highway 70, technically a federal road that was so rough and so sway-backed, it resembled a horse destined for the glue factory.

FORBES: Highways of the future? Not here

Lebanon's voters showed that same aspiration in a parliamentary election this past Sunday, casting their ballots to resist the sway of the Iranian-backed terrorists of Hezbollah.

FORBES: Freedom's Edge