to the core

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

hasta la médula, por completo

completely; thoroughly; to the greatest extent

:
He was rotten to the core.
Estaba podrido hasta la médula.
She was a New Yorker to the core.
Era neoyorquina hasta la médula.