/ Dictionary / Index O open die: Meaning and Definition of Find definitions for: o'pen die' Pronunciation: [key] — Metalworking. Metalworking. a die of flat, concave, or hollowshape that only minimally restricts lateral flow. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. open diapason open door Related Content Daily Word Quiz: vertigo Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language