ὄρνις
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)
ὁ, also ἡ Il.9.323, 14.290, al., freq. in Att., cf. 111 ; gen. ὄρνῑθος; acc. sg. ὄρνῑθα and ὄρνιν, neither in Hom. : pl., nom. and acc. ὄρνῑθες, -θας, but in acc. also ὄρνεις or ὄρνῑς (S.OT966, E.Hipp.1059, Ar.Av.717, 1250, 1610, D.19.245, etc.):—also ὄρνιξ, PCair.Zen.375.1 (iii B. C.), v.l. in Ev.Luc.13.34, called Ion. and Dor. by Phot. (but ὄρνις nom. in Alcm. 26.4); acc.
A ὄρνῑχα Pi.O.2.88; gen. ὄρνῑχος Id.I. 6(5).53: nom. pl. ὄρνῑχες B.5.22, Theoc.7.47; gen. pl. ὀρνίχων Alcm. 67, Abh.Berl.Akad.1925(5).33 (Cyrene, iv B. C.) ; dat. ὄρνιξι, ὀρνίχεσσι, Pi.P.5.112,4.190 (ὄρνιξι also in PLond.1.131r.125, al. (i A. D.)): on the gender and declens., v. Ath.9.373 sq. (Cf. ὄρν-εον, Goth.ara, gen. arins 'eagle', etc.) [In the trisyll. cases ῑ always: Hom. has ὄρνῑς in Il.9.323,12.218, but ὄρνῐς ib.24.219 ; and later Ep. use both ὄρνῑς and ὄρνῐς: in Trag. both quantities are found, ὄρνῐς in A. Fr.304.3 (-ῐν), S.Ant.1021, El.149 (lyr.), Fr.654, E.HF72, and so Philem.79.10 ; but ὄρνῑς E.Ba.1365, and always in Ar. (Av.103, al.), for in ib.168, the words τίς ὄρνῐς οὗτος; are borrowed from Sophocles; ὄρνῑς is said to be Att., EM632.8.] I bird, including birds of prey and domestic fowls, Hom., etc.; applied to ostriches, X. An.1.2.7 : freq. added to the specific names, ὄρνισιν ἐοικότες αἰγυπιοῖσιν Il.7.59 ; λάρῳ ὄρνιθι ἐοικώς Od.5.51; ὄ. ἀηδών, πέρδιξ, S.Aj. 629,Fr.323 ; ὄ. ἁλκυών, ὄ. κύκνος, E.IT1089 (lyr.), Hel.19. II like οἰωνός, bird of omen, from the flight or cries of which the augur divined, Hes.Op.828 ; δεξιός, ἀριστερὸς ὄρνις, Il.13.821, Od.20.242, al. ; χρηστηρίους ὄρνιθας A.Th.26, cf.Ag.112,157 (both lyr.); ὄ. αἴσιος S.OT52, cf. Plu.Fab.19, Gal.12.314 ; ὀρνίθων οἰωνίσματα E.Ph. 839. 2 metaph., omen taken from the flight or cries of birds, Il.10.277, al.: generally, omen, presage, without direct reference to birds, 24.219, Pi.P.4.19 ; ὄρνιθα δ' οὐ ποιῶ σε τῆς ἐμῆς ὁδοῦ A.Fr.95, cf. E.IA988, Ar.Pl.63, Av.719 sqq.; v. ὅδιος. III in Att. ὄρνις, ὁ, is mostly, cock, S.El.18 ; κοκκυβόας ὄ. Id.Fr.791, cf. Ar.V.815 ; ὄρνις, ἡ, hen, Men.167,168, PCair.Zen.266 (iii B. C., pl.); ἀλέκτορα καὶ ὄρνιθα τελέαν cock and hen, TAM2(1).245.8 (Lycia); in full, ὄ. ἐνοίκιος A.Eu.866 ; θήλεια ὄ. S.Fr.477 ; πότερον ὄ. ἢ ταὧς; Ar.Av.102 (with play on this signf. and signf. I) ; ὁ ὄρνιξ ὁ σιτευτός fatted fowl, PCair.Zen.375.1 ; ὀρνίθων φοινικολόφων Theoc.22.72, cf. 24.64, Mosch.3.49 ; ὄ. οἰκίης Babr.17.1 ; also, goose, Id.123.1. IV in pl. sts., bird-market, D.19.245 ; cf. ὄρνεον 11. V Μοισᾶν ὄρνιχες song-birds, i.e. poets, Theoc.7.47. VI Provs.: διώκει παῖς ποτανὸν ὄρνιν A.Ag. 394 (lyr.) ; ὄ. ὥς τις ἐκ χερῶν ἄφαντος E.Hipp.828; ὀρνίθων γάλα 'pigeon's milk', i.e. any marvellous dainty or good fortune, Ar. V.508,Av.1673, Mnesim.9, Men.936 ; but ὄρνιθος γάλα white of egg, Anaxag.22 ; also a plant, v. ὀρνιθόγαλον. VII a constellation, later Cygnus, Eudox. ap. Hipparch.1.2.16, Arat.275, Ptol.Tetr. 26.