Ostracize is a verb
Quite the opposite.os·tra·cize/ˈästrəˌsīz/Verb1. Exclude (someone) from a society or group.
Shakespeare did not use the word ostracize so you must be thinking of someone else's Romeo and Juliet. Ostracize is a word meaning to banish, deriving from the ancient Greek custom in Athens where the citizens could vote (by writing on bits of broken pottery called ostrakoi, hence "ostracize") to banish one of the citizens from the city as a punishment. "Banish" is of course a word that Shakespeare actually did use in his play Romeo and Juliet.
Do not ostracize Molly from your circle of friends just because she has braces and ugly pigtails.
The Klu Klux Klan would ostracize any member who defended an African American. The faculty was known to ostracize any professor who opposed the popular dean.
ostracize
The other children ostracize Ruthie because she is considered dirty and unkempt. They associate her appearance and smell with poverty and homelessness, which leads them to exclude her from their social circle. Additionally, they view her as an outsider and are hesitant to interact with someone who is different from them.
A mom could tell her son, "Dont ostracize your brother!" as in dont leave him out and make sure he is included
To be "ostracized" means to be totally shunned by those around you. You "cease to exist". Everyone ignores you, they walk past you as if you aren't there. If you interject into a conversation with other people, it is not acknowledged - it is as if you are invisible. You become what George Orwell called a "non-person".
To ostracize means to exclude or shun someone from a group or society as a form of punishment or social rejection. This can be done deliberately to isolate or alienate an individual.
Great Britten and New York
It comes from the Greek word ostrakhoi, which means potsherds. Greeks used to vote on whether to banish someone from the city by casting ballots made from broken pots.