To ostracize comes from ostrakon, a pottery shard Athenians used as a ballot to exile someone.
Once a year Athenians could vote to exile a citizen for ten years. They scratched the name on a broken pottery shard, an ostrakon. Archaeologists have found thousands of these 'ballots'.
Getting kicked out of the family group chat for posting OU memes. Ostracized.
Watch for teams quietly ostracizing someone who disagrees. Dissent is useful.
Practice it in Skepsis