ostracize

1. (transitive, Ancient Greece, historical) To ban a person from a city for five or ten years through the procedure of ostracism.Examples: "Republics have been accused of being ungrateful. Aristides was ostracised for being called the Just, and Themistocles banished, after saving his country from desolation."; "[T]he person who was ostracised was obliged to leave Athens within ten days after the sentence, and unless a vote of the people recalled him before the expiration of that time, to stay in exile for ten years."; "The Athenian Hyperbolus, who had been ostracized some years before by the coalition of Nikias and Alkibiades, together with their respective partisans—ostracized (as Thucydides tells us) not from any fear of his power and over-transcendent influence, but from his bad character and from his being a disgrace to the city—and thus ostracized by an abuse of the institution—was now resident at Samos."BritishEnglishOxfordUShistoricaltransitive

2. (by extension) To exclude a person from a community or from society by not communicating with them or by refusing to acknowledge their presence; to refuse to associate with or talk to; to shun.Examples: "You then moſt Noble Equivocations and Alluſions, whom Rhetorick would Oſtraciſe, ſeek Revenge for your Baniſhment; [...]"; "The inflexible advocate[s] of the people's rights, were either expelled the Senate Chamber, ostracised, or immolated on the reeking altars of patriotism, by the encrimsoned sword of slaughtering persecution."; "[O]thers may wonder at the mawkish taste of a community which, instead of ostracising such a palpable charlatan at once, attended and praised all that he had to say!"Synonyms: blackball, cut someone dead, give someone the cold shoulder, send to Coventry, leper, brush off, disregard, dissembleAntonyms: ignore, fail to noticeBritishEnglishOxfordUSbroadly