/ Dictionary / Index H heavy-duty: Meaning and Definition of Find definitions for: heav•y-du•ty Pronunciation: (hev'ē-d'tē, -dy'-), [key] — adj. providing an unusual amount of power, durability, etc.: heavy-duty machinery; heavy-duty shoes. very important, impressive, or serious: heavy-duty involvement; heavy-duty questions. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: heavy-duty (Thesaurus) heavy cruiser heavy-footed 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