在英语中，后背通常用"back"来表示。来源于拉丁语"spina dorsalis"，意思是"背骨"。例如：

I hurt my back while lifting the box. (我抬盒子时把后背拉伤了。)

He has a tattoo on his back. (他的后背上有一个纹身。)

She leaned against the wall, resting her back. (她靠在墙上，休息着后背。)