outstroke

[ out-strohk ]
/ ˈaʊtˌstroʊk /

noun

a stroke in an outward direction.
(in an engine) the stroke during which the piston rod moves outward from the cylinder.

Origin of outstroke

First recorded in 1850–55; out- + stroke1
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019