A more thorough explanation:

Expleta is a term used in historical law to refer to the rents and profits earned from an estate. It can also be called expletia or explecia.

• John inherited a large estate from his grandfather. He was able to earn a lot of money from the rent paid by tenants and the profits from farming the land. These earnings are considered expleta.
• When the lord of the manor collected the rent from his tenants, he would keep a portion of it as expleta.

These examples show how expleta refers to the income earned from an estate. It was an important source of revenue for landowners and lords in the past.