discommon

from The Century Dictionary.

• To deprive of the character of a common, as a piece of land; appropriate to private ownership, as common land, by separating and inclosing it.
• To deprive of the right of a common.
• To deprive of the privileges of a place; especially, in the universities of Oxford and Cambridge, to prohibit (a tradesman or townsman who has violated the regulations of the university) from dealing with the undergraduates. The power to do this lies with the vice-chancellor.

from the GNU version of the Collaborative International Dictionary of English.

• transitive verb rare To deprive of the right of common.
• transitive verb rare To deprive of privileges.
• transitive verb (Law) To deprive of commonable quality, as lands, by inclosing or appropriating.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• verb To deprive of the right of common.
• verb To deprive of privileges.
• verb law To deprive (lands etc.) of commonable quality, by enclosing or appropriating.