κάρα θερίζειν
From LSJ
Κακῷ σὺν ἀνδρὶ μηδ' ὅλως ὁδοιπόρει → Hominem malignum nec viae comitem cape → Nimm einen Schurken nie zum Wegbegleiter dir
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