/ Dictionary / Index D double block: Meaning and Definition of Find definitions for: dou'ble block' Pronunciation: [key] — Mach. Mach. a block having two sheaves or pulleys. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. double-blind double blossom Related Content Daily Word Quiz: eureka Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language