ἀττικίζειν
From LSJ
τὸ δ' ἐξαίφνης τὸ ἐν ἀναισθήτῳ χρόνῳ διὰ μικρότητα ἐκστάν → suddenly refers to what has departed from its former condition in a time imperceptible because of its smallness
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).