shotgun start
n.— «After the mandatory pit stop, teams set out for the next keg in their sequence. In golf parlance, a shotgun start is used, meaning everyone begins at a different point.» —“Crossage players claim streets in 500-year-old Belgian tradition” by Kevin Dougherty Stars & Stripes Mar. 18, 2007. (source: Double-Tongued Dictionary)
Further reading
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