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hare scramble

n. (context slang English) A motorcycle or quad race though wooded or natural terrain.

Wikipedia
Hare scramble

thumb|upright=1.35|Racer at a hare scramble event near Hyden, Kentucky Hare scramble is a form of off-road motorcycle racing that varies in distance and time, with the riders completing multiple laps around a marked course through wooded or other rugged natural terrain.