συνεργητέον
From LSJ
Οὕτως ἔδειξέν μοι κύριος καὶ ἰδοὺ ἐπιγονὴ ἀκρίδων ἐρχομένη ἑωθινή, καὶ ἰδοὺ βροῦχος εἷς Γωγ ὁ βασιλεύς (Amos 7:1) → Thus the Lord showed me and look, early-morning offspring of locusts coming, and look, one locust-larva: Gog the king.
English (LSJ)
A one must assist, τῇ ἐκβολῇ Sor.2.48, cf. Archig. ap.Gal.12.676.
Greek (Liddell-Scott)
συνεργητέον: ῥηματ. ἐπίθετ. τοῦ συνεργῶ, δεῖ συνεργεῖν, Σωραν. περὶ Γυναικ. παθῶν σ. 266Α.