ὥρασι
From LSJ
εἰ ἀποκρυπτόντων τῶν Μήδων τὸν ἥλιον ὑπὸ σκιῇ ἔσοιτο πρὸς αὐτοὺς ἡ μάχη καὶ οὐκ ἐν ἡλίῳ → if the Medes hid the sun, the battle would be to them in the shade and not in the sun
English (LSJ)
ὥρᾱσιν (also ὥρας, Men., v. infr.), Adv.: (old loc. pl. of ὥρα (c)):—
A in season, in good time, μὴ ὥρασιν ἵκοιτο, as an imprecation, may he not come in season, i.e. bad luck to him! Alex.266.1, Luc.DMeretr.10.3; μὴ ὥρας σύ γε . . ἵκοιο Men.Pk.131; μὴ ὥρασ' ἵκοισθε (Dind. for ὥρας) Ar.Lys.1037(troch.); ὁ μὴ ὥρασι that fellow—bad luck to him! ib.391; μὴ ὥρασιν ἱκοίμην, εἰ . . Luc.Salt.5; also μὴ σύ γ' εἰς ὥρας ἵκοιο Babr.53.7 (cf. ὥρα (C) B.1.4).—For the form, cf. θύρασι, Ὀλυμπίασι.