be in someone's blood
US /bi ɪn ˈsʌm.wʌnz blʌd/
UK /bi ɪn ˈsʌm.wʌnz blʌd/

1.
피에 흐르다, 천성이다
if an ability or quality is in someone's blood, they have it naturally, often because other members of their family also have it
:
•
Music really seems to be in his blood; his whole family are musicians.
음악은 정말 그의 피에 흐르는 것 같아. 온 가족이 음악가거든.
•
She's a natural leader; it must be in her blood.
그녀는 타고난 리더야. 그건 분명 그녀의 피에 흐르는 거야.