/ Dictionary / Index G guard pin: Meaning and Definition of Find definitions for: guard' pin" Pronunciation: [key] — Horol. Horol. (in a lever escapement) a pin on the lever, meeting the safety roller in such a way as to prevent the lever from overbanking. See diag. under Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. guard of honor guardrail Related Content Daily Word Quiz: procrastinate Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language