An athlete who participates in bobsledding, a winter sport where teams of 2-4 people push and ride in a streamlined sled down an icy track.
From bobsled (a sled that bobs up and down during the run, from bob meaning to move up and down) plus the agent suffix -er meaning one who performs the action.
Bobsledders need explosive power like sprinters plus coordination like figure skaters—they're often recruited from track and field because the initial push acceleration is more important than the steering.
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