Your hedgehog may huff or roll into a ball.

你的刺猬可能会绻成一个小球。

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Some animals roll themselves into a ball for protection.

有些动物蜷缩成一团以保护自己。

《牛津词典》

You should roll the wool into a ball before you start knitting.

在你开始编织之前，你应该把毛线卷成一个球。

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An example closer to everyday experience is that of a ball placed at the crest of a hill, which might roll into any of several valleys depending on slight differences in its initial position.

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But any chance of a wobble by Manchester City was ended when Onuoha was allowed to stride unchallenged into the area and roll the ball into the bottom corner of the net.

BBC: Man City 5-1 Birmingham