/ ˈbɒbsleɪ; NAmE ˈbɑːb-/ ( BrE ) ( NAmE bob·sled / ˈbɒbsled; NAmE ˈbɑːb-/) (also bob ) noun
a racing sledge (= a vehicle for two or more people that slides over snow)
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WORD ORIGIN
mid 19th cent. (originally US, denoting a sleigh made of two short sleighs coupled together and used for hauling logs): from bob in the sense short + sleigh .