/ Dictionary / Index H high sign: Meaning and Definition of Find definitions for: high' sign" Pronunciation: [key] a gesture, glance, or facial expression used as a surreptitious signal to warn, admonish, or inform. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. high sea high society 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