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
subs.
P. and V. μηχανή, ἡ, μηχάνημα, τό, ὄργανον, τό.
