Learn how to say Ostracizes correctly in English with this tutorial pronunciation video.
Oxford dictionary definition of the word ostracize:
1 [with object] exclude from a society or group:
she was declared a witch and ostracized by the villagers
2(in ancient Greece) banish (an unpopular or overly powerful citizen) from a city for five or ten years by popular vote:
Themistocles was indeed out of favour at Athens by the end of the 470s, when he was ostracized
mid 17th century: from Greek ostrakizein, from ostrakon ‘shell or potsherd’ (on which names were written in voting to banish unpopular citizens)