to the core

US /tə ðə kɔr/
UK /tə ðə kɔr/
"to the core" picture
1.

뼈 속까지, 천상

completely; thoroughly; to the greatest extent

:
He was rotten to the core.
그는 뼈 속까지 썩었다.
She was a New Yorker to the core.
그녀는 천상 뉴요커였다.