σφάλλεσθαι
From LSJ
πάντες γὰρ οἱ λαβόντες μάχαιραν ἐν μαχαίρῃ ἀπολοῦνται → all they that take the sword shall perish with the sword
Greek > English (Woodhouse Verbs Reversed)
(see also σφάλλω): fail, stagger, baulked of, be at fault, be baffled in, be baffled, be baulked of, be cheated, be crossed in, be deceived in, be defeated, be defrauded of, be disappointed of, be discomfited, be foiled in, be foiled, be mistaken, be thwarted of, be wrong about things, be wrong, fail in attaining, fail in, go wrong, have a spill, make a false step, make a mistake, not succeed in, suffer a reverse