to the core

idiom

: in a very complete or extreme way —
used for emphasis
He is patriotic to the core.Her family is English to the core.He's rotten to the core.They were shaken to the core.

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“To the core.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/to%20the%20core. Accessed 18 Aug. 2022.

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