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Phrase(s): blue blood
1. Fig. the blood [heredity] of a noble family; aristocratic ancestry. • The earl refuses to allow anyone who is not of blue blood to marry his son. • Although Mary’s family is poor, she has blue blood in her veins. 2. Fig. a person of aristocratic or wealthy ancestry. • Because his great-grandparents made millions, he is regarded as one of the city’s blue bloods.
McGrawhill's American Idioms And Phrasal Verbs