συμπρεσβεύειν
From LSJ
ἀλλὰ τί ἦ μοι ταῦτα περὶ δρῦν ἢ περὶ πέτρην → why all this about trees and rocks, why all these things we have nothing to do with
Greek > English (Woodhouse Verbs Reversed)
(see also: συμπρεσβεύω) be fellow-ambassador, go on an embassy with others