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
και ρωθωνίζω Ν ρουθούνι / ῥώθωναναπνέω θορυβωδώς με τη μύτη.