女生回头的英文表达可以是 "a woman turning around" 或者 "a woman turning her head."

这个表达的来源可能是描述女生转过身来或者把头转向某个方向的动作。

下面是一些英文例句和中文翻译:

I saw a woman turning around in the park. 我在公园里看到有个女生转过身来。
She turned her head to look at me. 她转过头来看我。
The woman turned around to check her reflection in the mirror. 那个女人转过身来看看镜子里的自己。
I heard a woman turning around behind me. 我听到后面有个女人转过身来。