在英语中，"彻底切割"的意思可以用"sever completely"来表达。"Sever"是一个动词，意思是"切断"或"断开"。"Completely"是一个副词，意思是"完全地"。

例句：

The rope was severed completely by the sharp blade. (这根绳子被锋利的刀刃彻底切断了。)
The connection was severed completely when the power went out. (当电力中断时，这个联系被彻底切断了。)
She severed all ties with her former friends. (她和以前的朋友完全断绝了关系。)