up-stroke

upstroke

[uhp-strohk]
noun
an upward stroke, especially of a pen or pencil, or of a piston in a vertical cylinder.

Origin:
1820–30; up- + stroke1

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World English Dictionary
upstroke (ˈʌpˌstrəʊk)
 
n
1.  a.  an upward stroke or movement, as of a pen or brush
 b.  the mark produced by such a stroke
2.  the upward movement of a piston in a reciprocating engine

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