She spread out her arms, not knowing what to do.

她扎煞着手，不知该干什么。

《新英汉大辞典》

I then turned and shook hands with Rabin, after which I stepped back out of the space between them and spread my arms to bring them together.

然后我转过身，同拉宾握手，然后后退，给他们留出空间，伸出我的双臂把他们凑在一起。

youdao

He spread out his arms and shrugged his shoulders.

他无可奈何地摊开双臂耸了耸肩。

youdao

Television footage showed one man lying spread out on the ground, holding out his arms, surrounded by police.

BBC: Major police operation in Boston area after shooting