- an upward stroke, especially of a pen or pencil, or of a piston in a vertical cylinder.
Origin of upstroke
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for upstroke
Her axe shone, on the upstroke, on the downstroke, as she hacked at his hand.The Were-Wolf</p>
The parts are in correct mechanical balance because two pistons are on the upstroke while the other two are descending.Aviation Engines</p>
Victor Wilfred Pag
During an upstroke this closes, and the other opens; the reverse happening during a downstroke.
After the downstroke is completed, the teeth A will cut on the upstroke, the teeth B cutting on the downstroke, etc.The Boy Mechanic, Book 2
During the upstroke the cup collapses inwards and allows air to pass by it.
- 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
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