to the core

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

透, 地地道道

completely; thoroughly; to the greatest extent

:
•
He was rotten to the core.
他坏透了。
•
She was a New Yorker to the core.
她是个地地道道的纽约人。
:
core