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in one's blood

Also, in the blood. Part of one's essential nature. For example, The whole family loves music; it's in their blood, or Sailing somehow gets in your blood. Also see run in the blood.

The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.