A more thorough explanation:

Definition: Surrender by bail refers to the act of a surety delivering a prisoner, who had been released on bail, into custody.

Example: John was released on bail, with his friend Tom acting as his surety. However, John failed to appear in court on the scheduled date. As a result, Tom had to surrender John to the authorities.

Explanation: In this example, Tom had to surrender John to the authorities because John did not appear in court as required. This is an example of surrender by bail, where the surety is responsible for delivering the prisoner into custody when they fail to comply with the terms of their bail.