A more thorough explanation:

Nova causa obligationis is a Latin term that refers to a new ground of obligation. It means that a new reason or cause has arisen that creates a legal obligation for someone.

One example of nova causa obligationis is when a person signs a contract to buy a car, but the car is destroyed before they can take possession of it. In this case, the seller may be obligated to provide a replacement car or refund the buyer's money, even though the original contract did not include this provision.

Another example is when a tenant signs a lease agreement with a landlord, but the landlord fails to make necessary repairs to the property. The tenant may be able to argue that the landlord's breach of the lease agreement creates a new ground of obligation, requiring the landlord to make the repairs or compensate the tenant for any damages.

These examples illustrate how a new ground of obligation can arise in situations where the original agreement did not anticipate certain circumstances. In such cases, the parties may need to renegotiate the terms of their agreement or seek legal remedies to enforce their rights.