ἀττικίζειν
From LSJ
οὕτω γὰρ συμβαίνει ἅμα καὶ ἡ τῶνδε εὐγένεια κοσμουμένη → for by so doing we shall also celebrate therewith the noble birth of these heroes
Lexicon Thucydideum
ab Atheniensibus stare, to side with the Athenians, 3.62.1 (de Plataeensibus concerning the Plataeans), 8.87.1 (de Thissapherne concerning Tissaphernes).