ἐμφρουρέω
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)
A keep guard in a place, Th.4.110, 8.60: c. acc. loci, D.C.47.30, 50.12:—Pass., to be imprisoned, τέχναις Phalar.Ep.122.4.