Sentence:  On the subject of environments, our anatomically contoured houndstooth design provides exceptional traction on all terrains and in all weather conditions. What's more, the studs have a unique flex action: they automatically release any turf they may have picked up on <WSD>downstrike</WSD>. 
Meaning of the word marked with <WSD> tags:  A downstroke; A downward movement that terminates in striking something.