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definitions

upstroke

[uhp-strohk]
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noun

an upward stroke, especially of a pen or pencil, or of a piston in a vertical cylinder.

Origin of upstroke

First recorded in 1820–30; up- + stroke1
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for upstroke

Historical Examples of upstroke

  • Her axe shone, on the upstroke, on the downstroke, as she hacked at his hand.

    The Were-Wolf

    Clemence Housman

  • The parts are in correct mechanical balance because two pistons are on the upstroke while the other two are descending.

    Aviation Engines

    Victor Wilfred Pag

  • During an upstroke this closes, and the other opens; the reverse happening during a downstroke.

    How it Works

    Archibald Williams

  • After the downstroke is completed, the teeth A will cut on the upstroke, the teeth B cutting on the downstroke, etc.

  • During the upstroke the cup collapses inwards and allows air to pass by it.

    How it Works

    Archibald Williams

British Dictionary definitions for upstroke

upstroke

noun

  1. an upward stroke or movement, as of a pen or brush
  2. the mark produced by such a stroke
the upward movement of a piston in a reciprocating engine
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012