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to the core

see rotten to the core.

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The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.

Related Words for to the core

perfectly, fully, absolutely, thoroughly, extremely, quite, altogether, entirely, wholly, totally, absolute, complete, confirmed, congenital, deep-rooted, deep-seated, die-hard, entrenched, fixed, full-fledged