/ Dictionary / Index D double-action: Meaning and Definition of Find definitions for: dou•ble-ac•tion Pronunciation: (dub'ul ak'shun), [key] — adj. (of a firearm) requiring only one pull of the trigger to cock and fire it. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. double-acting double agent Related Content Daily Word Quiz: immense Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language