/ Dictionary / Index U underinsure: Meaning and Definition of Find definitions for: un•der•in•sure Pronunciation: (un"dur-in-shoor', -shûr'), [key] — -sured, -sur•ing. to insure for an amount less than the true or replacement value: It's risky to underinsure your home. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. underinsurance underived Related Content Daily Word Quiz: frugal Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language