lop off (someone's) head

Translations
отрубить (кому-то) голову
In the story, the king threatened to lop off his head.
В истории король угрожал отрубить ему голову.
Definitions
To cut off someone's head, typically with a sharp instrument; to behead. This phrase can be used literally, referring to execution or violence, or figuratively, meaning to remove someone from a position of power or authority abruptly.