αἶπος
From LSJ
θοῦ, Κύριε, φυλακὴν τῷ στόµατί µου καὶ θύραν περιοχῆς περὶ τὰ χείλη µου → set a guard over my mouth, Lord; keep watch over the door of my lips | set a guard, O Lord, over my mouth; keep watch over the door of my lips (Psalm 140:3, Septuagint version)
English (LSJ)
εος, τό, (αἰπύς)
A height, steep, A.Ag.285,309, etc.; πρὸς αἶπος ὁδοιπορῆσαι, ἰέναι to toil up-hill, Hp.Morb.2.51,70; πρὸς αἶπος ἔρχεται, metaph. of a difficult task, E.Alc.500: hence αἶ. (v.l. ἆπος ) ἐκβαλὼν ὁδοῦ, i.e. the weariness of the ascent (expl. by Hsch. as κάματος), Id.Ph.851 (unless ἐκβαλών = 'forgetting').