συνθάπτω
From LSJ
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
English (LSJ)
A bury together, join in burying, τινα A.Th.1032, S.Aj. 1378, E.Hel.1545, Pl.Lg.909c, etc.; τινά τινι one with another, E. Alc.149, Demad.13, IG14.943 (Ostia):—Pass., to be buried with, τῷ ἀνδρί Hdt.5.5, cf. Th.1.8; συνετάφη τοῖς σώμασιν ἡ ἐλευθερία Lycurg. 50; συνετάφημεν [τῷ Χριστῷ] διὰ τοῦ βαπτίσματος Ep.Rom.6.4.
