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[uhp-strohk] /ˈʌpˌstroʊk/
an upward stroke, especially of a pen or pencil, or of a piston in a vertical cylinder.
Origin of upstroke
1820-30; up- + stroke1 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for upstroke
  • Unlike other birds, hummingbirds get a portion of their lift during the upstroke of their wings.
  • Modern birds use a similar bone in flight, drawing their wings toward their bodies during an upstroke.
  • When a snowy owl flies, its wings make a powerful downstroke and a quick upstroke.
  • If the penguin is stroking, you can expect some of them upstroke and the other ones downstroke.
  • The secret lies right where you wouldn't expect it: in the bird's upstroke.
  • After the powerful downward flap, birds fold the wing slightly inwards during the upstroke.
  • On the other hand, the plunger in a hydraulic lift pump lifts liquid on the upstroke and also on the downstroke.
British Dictionary definitions for upstroke


  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
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