ἀποτέμνειν τὴν κεφαλήν
From LSJ
ἀλλ' ἦν ἅπαντα τεταγμένα νόμων ἐπιταγαῖς → but all their acts were regulated by prescriptions set forth in laws
Greek > English (Woodhouse)
behead, decapitate, ax, bring to the block, chop off one's head, cut off the head, cut the head off, decollate, guillotine