/ Dictionary / Index G guard duty: Meaning and Definition of Find definitions for: guard' du"ty Pronunciation: [key] a military assignment involving watching over or protecting a person or place or supervising prisoners. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. guard dog guarded Related Content Daily Word Quiz: fidelity Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language