/ Dictionary / Index H high-low-jack: Meaning and Definition of Find definitions for: high-low-jack Pronunciation: (hī'lō"jak'), [key] — n. See(def. 2). Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: high-low-jack (Thesaurus) high-low highly Related Content Daily Word Quiz: soporific Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language