Definition of to the core
- 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.
: a central and often foundational part usually distinct from the enveloping part by a difference in nature : such as
: the usually inedible central part of some fruits (such as a pineapple)
: the portion of a foundry mold that shapes the interior of a hollow casting
: to remove a core (see 1core 1a) from
: a group of people
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