ὄναρ
οἱ τοῖς πέλας ἐπιβουλεύοντες, λανθάνουσι πολλὰκις ὑφ' ἑτέρων τοῦτ' αὐτὸ πάσχοντες → when people plot against their neighbours, they fall victim to the same sort of plot themselves
English (LSJ)
τό, used only in nom. and acc. sg., the other cases being supplied by ὄνειρος (q. v.) :—
A dream, vision in sleep, opp. a waking vision, οὐκ ὄ., ἀλλ' ὕπαρ ἐσθλόν Od.19.547, cf. 20.90 ; ἡλίῳ δείκνυσι τοὔναρ S.El.425 ; εἶδον ὄ. Ar.Eq.1090 ; ἄκουε δὴ ὄ. ἀντὶ ὀνείρατος dream for dream, Pl.Tht.201d ; ὥστε μηδὲ ὄ. ἰδεῖν, of profound sleep, Id.Ap. 40d : prov., τὸ ἐμόν γ' ἐμοὶ λέγεις ὄ. 'you are telling me what I know already', Id.R.563d, cf. Suid. s.v. ταὐτὸν πέπονθα (cf. ὄνειρος 1, ὄνειαρ II). 2 prov. of anything fleeting or unreal, ὀλιγοχρόνιον . . ὥσπερ ὄ. Thgn.1020 ; σε παρέρχεται ὡς ὄ. ἥβη Theoc.27.8 ; πόθος δέ μοι ὡς ὄ. ἔπτα Bion 1.58 : in Prose, ἡ ἐμὴ [σοφία]... ὥσπερ ὄ. οὖσα Pl. Smp.175e, cf. Men.85c ; ὡς ὄ. ἐλευθερίας ὁρῶντας Plu.Thes.32 ; and without ὡς, σκιᾶς ὄ. ἄνθρωπος Pi.P.8.95 ; ὄ. ἡμερόφαντον ἀλαίνει, of an old man, A.Ag.82 (anap.). II in Trag. and Att. freq. as Adv., in a dream, in sleep, ὄ. γὰρ ὑμᾶς νῦν Κλυταιμνήστρα καλῶ Id.Eu.116 ; ὄ. διώκεις θῆρα ib.131 ; ὄ. πνεύσαντα νυκτός S.Fr.65 : freq. in Pl., ὄ. ἐπλουτήσαμεν Tht.208b ; ὄ. ὀνείρατα διηγεῖσθαι ib.158c, etc. ; also οὐδ' ὄ. not even in a dream, E.Fr.107, Herod.1.11 ; πολιτικὸς ἀνὴρ οὐδ' ὄ. Cic.Att.1.18.6 ; μηδ' ἰδὼν ὄ. not even in my dreams, E.IT518, cf. Pl. Tht.173d, Mosch.4.18 ; ἃ μηδ' ὄ. ἤλπισαν D.19.275 : hence freq. opp. ὕπαρ, v. ὕπαρ 11 ; κατ' ὄναρ in a dream, condemned by Phryn.395, but quoted by him from Polemo, is also found in Ev.Matt.1.20, Aristid. Or.47(23).21 : with sense, in consequence of a dream, in SIG1147 (Crete, ii/iii A. D.), Supp.Epigr.2.405 (Macedonia).