ὑπονοστ-έω · hyponost-eō — LSJ
go down, sink, settle
go down, sink, Arist. Mete. 367a24, Plu. Them. 15; settle, of a stack of wood, Hdt. 4.62; of the earth in an earthquake, Arist. Mete. 365b12; of a river, ὑ. ἀνδρὶ ὡς ἐς μέσον μηρόν Hdt. 1.191, cf. Th. 3.89, Plu. Isid. 2.366e; of humours, εἰς τὸ βάθος Gal. 6.254.
2 settle, turn into, sink, decline, decline
settle, turn into a thing, εἰς χλευασμὸν καὶ γέλωτα Plu. Praec. 2.811e: metaph., sink, decline, ἐκ τοῦ φοβεροῦ ὑ. πρὸς τὸ εὐκαταφρόνητον Longin. 3.1; πρὸς τὸ μὴ ὄν Dam. Pr. 440; of the aged, decline in years, Poll. 2.21.