be in someone's blood
US /bi ɪn ˈsʌm.wʌnz blʌd/
UK /bi ɪn ˈsʌm.wʌnz blʌd/
1.
if an ability or quality is in someone's blood, they have it naturally, often because other members of their family also have it
:
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Music really seems to be in his blood; his whole family are musicians.
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She's a natural leader; it must be in her blood.