What is what does blood is thicker than water mean?

The phrase "blood is thicker than water" means that family ties are stronger than any other type of relationship, whether it is a friendship or romantic relationship. It suggests that familial bonds are more important and more enduring than other connections because they are based on a shared genetic and cultural heritage. This expression is an idiom that reflects the commonly held belief that family members should stick together and support one another no matter what, even in difficult times. However, blood relationships do not necessarily mean that they always have to be prioritized over other relationships, circumstances, or values.