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
SourceDutch (Woordenboekgrieks.nl)
συννναυβάτης -ου, ὁ [σύν, ναυβάτης] medeopvarende. Soph. Ph. 565.