downstroke

[doun-strohk]
noun
1.
a downward stroke, as of a machine part, piston, or the like.
2.
a downward stroke in writing, often heavier and darker than an upward stroke.

Origin:
1850–55; down1 + stroke1

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Example sentences
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.
During the following downstroke, fresh air and fuel are injected into the cylinder while the exhaust valve is closed.
On the other hand, the plunger in a hydraulic lift pump lifts liquid on the upstroke and also on the downstroke.
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