atticize

from The Century Dictionary.

• To use Atticisms or idioms peculiar to Attic Greek.
• To favor or side with the Athenians. Dean Smith.
• To make conformable to the language or idiom of Attica.
• Also spelled Atticise.

from the GNU version of the Collaborative International Dictionary of English.

• transitive verb To conform or make conformable to the language, customs, etc., of Attica.
• intransitive verb To side with the Athenians.
• intransitive verb To use the Attic idiom or style; to conform to the customs or modes of thought of the Athenians.