καθ' ἕνα

From LSJ

τάλαιναι κόραι Φαέθοντος οἴκτῳ δακρύων τὰς ἠλεκτροφαεῖς αὐγάς → girls, in grief for Phaethon, drop the amber radiance of their tears

Source

Greek > English (Woodhouse)

man by man, one by one