General Antonyms:
* Prohibit: This is the most direct opposite, meaning to forbid something.
* Prevent: This implies stopping something from happening.
* Deny: This means to refuse something.
Contextual Antonyms:
* Restrict: This is a more nuanced antonym, meaning to limit something.
* Disallow: This is a more formal synonym for "prohibit."
* Forbid: This is a more forceful synonym for "prohibit."
The best antonym for "allow" will depend on the specific situation.