upstroke

[ uhp-strohk ]

/ ˈʌpˌstroʊk /

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

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

The Were-Wolf |Clemence Housman
During an upstroke this closes, and the other opens; the reverse happening during a downstroke.

How it Works |Archibald Williams
During the upstroke the cup collapses inwards and allows air to pass by it.

How it Works |Archibald Williams

The stroke on the left side of that capital is first a down stroke, which is almost exactly retracted by an upstroke.

Warren Commission (4 of 26): Hearings Vol. IV (of 15) |The President's Commission on the Assassination of President Kennedy

upstroke

/ (ˈʌpˌstrəʊk) /

the upward movement of a piston in a reciprocating engine