/ Dictionary / Index H hacking jacket: Meaning and Definition of Find definitions for: hack'ing jack"et Pronunciation: [key] — Chiefly Brit. Chiefly Brit. a riding jacket having a tight waist, flared skirt, slanted pockets with flaps, and slits or vents at the sides or back. Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. hacking hackle Related Content Daily Word Quiz: spectral Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language