In the world of dreams the rules of reality do not necessarily apply. Each dream is unique and it's a direct link to the soul and spirit. Psychology provides its own theories on what dreams mean, but so did tradition and the study of dreams for thousands of years before any relevant science had developed.
Dream Meanings - Guarantee
If you dream that you make a guarantee to somebody, then you will offer your help. If someone makes a guarantee to you, then you will have support and help from an important person.