τοπαστέον
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)
(τοπάζω) one must conjecture, Hsch.
Greek (Liddell-Scott)
τοπαστέον: ῥηματ. ἐπίθ. τοῦ τοπάζω, δεῖ τοπάζειν, «τοπαστέον· ὑποληπτέον, ὑπονοητέον» Ἡσύχ.