Disallow (verb)

1. To refuse to allow or permit something.
2. To prohibit or forbid something.

Origin:

From the prefix dis- meaning "to undo" or "to reverse" and allow meaning to permit or give permission.

Examples:

1. The teacher disallowed the use of cell phones in class.
2. The manager disallowed the proposal due to financial constraints.
3. The government disallowed the use of certain chemicals in the manufacturing process.
4. The committee disallowed the motion due to lack of support.
5. The judge disallowed the evidence because it was obtained illegally.