Definition of “be rotten to the core” - English Dictionary

british dictionary

“be rotten to the core” in British English

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be rotten to the core

If a person or organization is rotten to the core, they behave in a way that is not honest or moral:

The whole legal system is rotten to the core.

(Definition of “be rotten to the core” from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)