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

Source

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).