Other forms: disestablished; disestablishing; disestablishes
To disestablish something is to take away its official status. If your school’s table tennis team isn’t any good, why not disestablish it and start a new one?
To establish something is to found it or to set it up. To disestablish something is to do the opposite. This word is typically used in the context of national churches. When such a church is disestablished, it loses its official status. This word is notable for being part of one of the longest words in the English language: opposition to disestablishment is called antidisestablishmentarianism.