bobsled
noun
[ ˈbɒbslɛd ]
• a mechanically steered and braked sled, typically manned by crews of two or four, used for racing down a steep ice-covered run with banked curves; a bobsleigh.
Origin:
mid 19th century (originally denoting a sled made of two short sleds coupled together and used for hauling logs): from bob2 in the sense ‘short’ + sled.