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
ἀπροβουλεύτως: без предварительного намерения, неумышленно (ἀποκτεῖναι Plat.).
