General Opposite:
* Release: This is the most common and direct opposite, meaning to set someone free from confinement or custody.
Specific Opposites based on Context:
* Free: If you are talking about a person being held captive, the opposite would be to set them free.
* Permit: If you are talking about being stopped or prevented from doing something, the opposite would be to permit or allow it.
* Expedite: If you are talking about delaying a process, the opposite would be to expedite it.
* Encourage: If you are talking about preventing someone from leaving, the opposite would be to encourage them to leave.
Other related words:
* Dismiss: To send someone away, often after questioning.
* Discharge: To release someone from custody or employment.
* Emancipate: To free someone from slavery or other forms of oppression.
The best word to use will depend on the specific situation you are referring to.