θυρεόω
From LSJ
εἰς πέλαγος σπέρµα βαλεῖν καὶ γράµµατα γράψαι ἀµφότερος µόχθος τε κενὸς καὶ πρᾶξις ἄκαρπος → throwing seeds and writing letters at sea are both a vain and fruitless endeavor
English (LSJ)
A cover with a shield, Aq.Is.31.5.
German (Pape)
[Seite 1227] mit dem Schilde bedecken, Sp.
Greek (Liddell-Scott)
θυρεόω: καλύπτω, προστατεύω διὰ θυρεοῦ, Ἀκίλ. Παλ. Διαθ.