to the core

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

fino al midollo, fino in fondo

completely; thoroughly; to the greatest extent

:
He was rotten to the core.
Era marcio fino al midollo.
She was a New Yorker to the core.
Era una newyorkese fino al midollo.