A more thorough explanation:

Joint obligation is a legal term that refers to a situation where two or more people are responsible for fulfilling a single obligation to another person or entity. This obligation can be a legal or moral duty to do something or refrain from doing something. For example, if two people take out a loan together, they have a joint obligation to repay the loan to the lender.

Another example of joint obligation is when multiple people are named as defendants in a lawsuit and are jointly responsible for paying any damages awarded to the plaintiff. In this case, each defendant is responsible for paying the entire amount of damages, not just a portion of it.

Joint obligation can also refer to a situation where one person is responsible for fulfilling an obligation to multiple people. For example, if a person owes money to two different creditors, they have a joint obligation to repay both creditors.