A more thorough explanation:

Definition: Prest money is a payment given to a soldier or sailor when they first join the military.

Example: During the American Civil War, soldiers were often given prest money when they enlisted. This money was usually a small amount, but it helped to provide for their immediate needs before they received their regular pay.

Explanation: The example illustrates how prest money was used to help soldiers and sailors who were just starting their military service. It was a way to provide them with some financial support until they received their regular pay. This was especially important during times of war when soldiers and sailors were often far from home and needed to purchase supplies and other necessities.