- 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
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.
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