A.“συνομοῦμαι” IPE4.79.37 (Chersonesus, iv/iii B.C.): pf. “-ομώμοκα” Hyp. Lyc.7, etc.:—swear together, “ἦ μὴν τὸν παῖδα . . φιλεῖσθαι” X.Smp.9.6; ἀποκτείνειν (ἀποκτενεῖν Cobet) Lycurg.126; “ὅρκους” Hdt.1.176; “ὅρκον” Plu.Brut.12.
2. c. acc. rei,pledge one's oath to a thing, promise by oath, “ἅ μοι ξυνώμοσας” S.Ph.1367 codd.; ξυνώμοσαν μὲν θάνατον . . πατρί joined in swearing death against him, A.Ch.978:—Pass., “τὸ πρᾶγμα πανταχόθεν ξυνομώμοται” Ar.Lys.1007.
II. join in a league or confederacy, Th.5.48, 6.18; “ξυνώμοσαν γάρ, ὄντες ἔχθιστοι τὸ πρίν, πῦρ καὶ θάλασσα” A.Ag.650.
2. ς. τισί form a confederacy with . . , Th. 1.71, 2.72; of an individual, “συνομωμοκυῖα πρὸς ἐμέ” Hyp. l.c.:— Med., form a league with, “Βοιωτοῖς” Plu.Alc.14.
3. esp. in bad sense, conspire with others, “τοῖς τριάκοντα” Arist.Rh.1400a18; ἐπί τινι against one, Hdt.7.235; “ἐπὶ τῷ δήμῳ” Ar.Eq.236; “ἐπί τινα” D.57.64; συνωμοσίαν ς. IPE l.c.: so in Med., οἱ τῷ Περπέννᾳ συνομοσάμενοι his fellow-conspirators, Plu.Sert.27.