/ Dictionary / Index D doubling: Meaning and Definition of Find definitions for: dou•bling Pronunciation: (dub'ling), [key] — n. Naut. the part of the upper or lower end of one spar of a mast that is overlapped by another spar above or below it. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: doubling (Thesaurus) double wingback formation doubloon Related Content Daily Word Quiz: designate Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language