ὄστρακον

Ostracize comes from Greek ὀστρακίζειν (ostrakizein, 'to banish by voting with potsherds'), from ὄστρακον (ostrakon, 'earthenware, potsherd, shell'). In 5th-century BCE Athens, citizens could vote once a year to exile any person they considered a threat to democracy. They scratched the person's name on a broken piece of pottery — an ostrakon — and if enough votes accumulated, that person was banished for ten years.

The procedure, called ostrakismos, was introduced by Cleisthenes around 508 BCE as a safety valve against tyranny. No trial, no formal charges — just a vote of the assembled citizens. Six thousand ostraka were required for exile. Archaeologists have found thousands of these sherds in the Athenian agora, still bearing the scratched names of Themistocles, Aristides, and other prominent Athenians.

The system was democratic but brutal. Aristides the Just was reportedly ostracized after a fellow citizen — who couldn't write — asked him to scratch the name 'Aristides' on the potsherd, not knowing he was speaking to Aristides himself. When asked why, the man said he was tired of hearing Aristides called 'the Just.' Popularity could be as dangerous as power.

English adopted 'ostracize' in the 1640s, and the word quickly generalized from political exile to social exclusion of any kind. You don't need pottery to ostracize someone now — a group chat left unread, an invitation not extended, a silence in the hallway. The mechanism changed; the cruelty remained.