σύμφρουρος
From LSJ
τά γε μὰν λίνα πάντα λελοίπει ἐκ Μοιρᾶν → but all the thread granted him by the Fates had run out
English (LSJ)
ον,
A watching with, μέλαθρον ξύμφρουρον ἐμοί the chamber that keeps watch with me, i.e. in which I lie sleepless, S.Ph. 1453 (anap.). II Thess. σύμφρουρος, ὁ, joint-φρουρός, Ἀρχ. Ἐφ. 1911.124 (Gonni); also σύμπρουρος, IG9(2).1058 (pl., Mopsium).
German (Pape)
[Seite 993] mit oder zugleich wachend, übertr., ὦ μέλαθρον ξύμφρουρον ἐμοί, Soph. Phil. 1439, wohl = das bei, mit mir aushält.