ὑπερθύριον
From LSJ
τίς δ' οἶδεν εἰ τὸ ζῆν μέν ἐστι κατθανεῖν, τὸ κατθανεῖν δὲ ζῆν κάτω νομίζεται → who knows if life is death, and if in the underworld death is considered life
English (LSJ)
[θῠ], τό, (θύρα)
A lintel of a door or gate, Od.7.90; ὑπερθυρίοις ἀραρυῖαι ἑπτὰ πύλαι Hes.Sc.271:—in Prose, ὑπέρθῠρον, τό, Hdt.1.179, IG12.372.201, 42(1).103 B97 (Epid., iv B. C.), 11(2).145.19 (Delos, iv/iii B. C.), Inscr.Délos 442 B70 (ii B. C.), J.BJ5.5.3, Plu.2.684a, etc.; also in Parm.1.12, Herod.2.65 (pl.). II Lat. hyperthyrum, frieze over the lintel, Vitr.4.6.2.