/ Dictionary / Index U undercroft: Meaning and Definition of Find definitions for: un•der•croft Pronunciation: (un'dur-krôft", -kroft"), [key] — n. a vault or chamber under the ground, esp. in a church. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. undercover undercurrent Related Content Daily Word Quiz: fabricate Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language