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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Based on the Random House Dictionary, © Random House, Inc. 2014.
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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

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
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.
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