repress

To repress is to suppress something such as a thought, feeling or emotion. (verb)

When you keep someone from expressing any dissent, this is an example of a situation where you repress the person.
When you prevent yourself from showing your happiness, this is an example of a situation where you repress your happiness.
When you will not allow yourself to think about a given event, this is an example of a situation where you repress the event.

See repress in Webster's New World College Dictionary