Delegata potestas non potest delegari

Delegata potestas non potest delegari means that the power or authority given to someone cannot be passed on to another person.

Imagine you have a toy that your mom gave you and told you to take care of it. She gave you the power to keep the toy safe and play with it. You cannot give that power to your friend to take care of the toy for you, because your mom gave the power to you only.

Similarly, a boss at work cannot give their power or authority to someone else to make decisions on their behalf. They have to make the decisions themselves, because the power was given to them and it cannot be shared or passed on to someone else.