/ Dictionary / Index U underbrush: Meaning and Definition of Find definitions for: un•der•brush Pronunciation: (un'dur-brush"), [key] — n. shrubs, saplings, low vines, etc., growing under the large trees in a wood or forest. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: underbrush (Thesaurus) underbred underbudgeted Related Content Daily Word Quiz: apogee Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language