τοῖς οἰκείοις βουλεύμασιν ἁλίσκεσθαι → hoist by one's own petard, hoist with one's own petard, hoist on one's own petard, hoisted by one's own petard, be hoist with one's own petard
ἀχίτων (-ωνος), -ον (AM)αυτός που δεν έχει ή δεν φορεί χιτώνα.