to admit defeat and no longer fight or resist an enemy or opponent
The rebels eventually surrendered.
to give up a right (such as a claim to something or the possession of something) because you have been forced to do so or because it is necessary to do so
He surrendered his diplomatic immunity.
to give something to someone in authority because you have been forced to do so or because it is necessary to do so
He was required to surrender his passport while inquiries were continuing.