/ Dictionary / Index L lockout box: Meaning and Definition of Find definitions for: lock'out box" Pronunciation: [key] lockbox (def. 3). Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. lockout Lockport Related Content Daily Word Quiz: heifer Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language