Breadcrumb Home > Dictionary > Index U upstroke: Meaning and Definition of Find definitions for: up•stroke Pronunciation: (up'strōk"), [key] — n. an upward stroke, esp. of a pen or pencil, or of a piston in a vertical cylinder. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: upstroke (Thesaurus) upstretched upsurge ✖ Related Content Daily Word Quiz: quadrumanous Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language