/ Dictionary / Index T trip line: Meaning and Definition of Find definitions for: trip' line" Pronunciation: [key] (in lumbering) a line for freeing a dog hook from a log at a distance. haulback. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. triplicity triplite 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