I was sure she knew the answer but for some reason she hung back.

我敢保证她知道答案，但不知为什么她不敢说出来。

《牛津词典》

He hung back before replying.

他在回答前犹豫了一阵子。

youdao

We hung back to let our parents go in first.

我们退了回去，让父母先进。

youdao

In fact I don't think the thing ever comes back, so I'm going to stop it because it really gets hung up here. And I'm going to restart it.

所以我想让程序停下来，因为我们卡在这儿了,所以我得重新开始一次。

麻省理工公开课 - 计算机科学及编程导论课程节选

And one day so I was eating my ice-cream because the archives were closed, and this woman came up, and she was probably about fity, or something like that, and she ordered ice-cream, and so this guy says, "Well, Madame whatever, Madame Dupuis, you remember that day don't you, when the Germans came back?" And she said, "Oh I sure do, they hung my husband from that pole."

有一天我正吃冰激凌呢,因为档案馆关了,有个女人过来,她大概有五十岁,她要了个冰激凌,然后这哥们说,"我也忘了什么夫人了,杜普斯夫人,你还记得那天吧,德国人来的那天",然后她说,"我当然记得,他们把我丈夫吊在那根柱子上"

耶鲁公开课 - 1871年后的法国课程节选

The officials hung back as Pakistani authorities handcuffed and hooded him, and took him to a safe house.

NEWYORKER: The Black Sites

But if he'd hung back, would he have managed on an intensely hot and humid day to set a new Olympic record?

WSJ: Menu

So far, of course, they have hung back.

NPR: Iraq Recommendations: Diplomacy with Iran, Syria