behead
The act of separating the head of a person from their body. Usually done with a knife, axe, sword, etc.
Example:
Teenager 1:"If I ever see that bully again I think I will behead her with a knife from the school cafeteria!"
Teenager 2: "Whoa you can't do that, dude!"
Teenager 1:"If I ever see that bully again I think I will behead her with a knife from the school cafeteria!"
Teenager 2: "Whoa you can't do that, dude!"