Meaning of “blood” - Learner’s Dictionary

blood

noun [ U ] uk us /blʌd/
RED LIQUID

A2 the red liquid that flows around your body:

a blood test/sample
FAMILY ORIGIN

the family or place that you come from:

There's Spanish blood in me.
be in your blood

If something is in your blood, you and other people in your family are interested in it or good at it:

Sailing is in my blood.

(Definition of “blood” from the Cambridge Learner’s Dictionary © Cambridge University Press)