ἀντιπρεσβεύεσθαι
From LSJ
Ἐκ τῶν πόνων τοι τἀγάθ' αὔξεται βροτοῖς → Crescunt labore cuncta bona mortalibus → Das Gute wächst den Sterblichen aus ihrem Müh'n
Greek > English (Woodhouse Verbs Reversed)
(see also: ἀντιπρεσβεύομαι) send a counter-embassy
Lexicon Thucydideum
legatos vicissim mittere, to send envoys in turn, 6.75.3.