Pronunciation: (tu-bog'un),[key] —n. a long, narrow, flat-bottomed sled made of a thin board curved upward and backward at the front, often with low handrails on the sides, used esp. in the sport of coasting over snow or ice.
—v.i. 1. to use, or coast on, a toboggan.
2. to fall rapidly, as prices or one's fortune.