Other forms: blue bloods
A blue blood is an aristocrat. Blue bloods come from privileged, noble families that are wealthy and powerful.
The word blood has long referred to family ties: people you are related to share the same blood. One specific type of family is composed of blue bloods: members of the aristocracy. Blue bloods have high social status. Shakespearean plays about kings, queens, princes, princesses, and other nobles are all about blue bloods. In America, families like the Kennedys and Bushes qualify as blue bloods.