- an upward stroke or movement, as of a pen or brush
- the mark produced by such a stroke
- the upward movement of a piston in a reciprocating engine
WordReference Random House Unabridged Dictionary of American English © 2026
up•stroke
(up′strōk′),USA pronunciation n.
- Mechanical Engineering, Mechanicsan upward stroke, esp. of a pen or pencil, or of a piston in a vertical cylinder.
- up- + stroke1 1820–30
Collins Concise English Dictionary © HarperCollins Publishers::
upstroke /ˈʌpˌstrəʊk/ n