bobsled

American Heritage® Dictionary of the English Language, Fourth Edition

1. n. A long racing sled with a steering mechanism controlling the front runners.
2. n. A long sled made of two shorter sleds joined in tandem.
3. n. Either of these two smaller sleds.
4. v. To ride or race in or as if in a bobsled.

Century Dictionary and Cyclopedia

1. n. A sled consisting of a body resting on two short sleds called bobs, placed one behind the other. Bob-sleds are used for the transportation of timber, etc., and, when of lighter build for coasting, are also called double-runners or simply bobs.

Wiktionary

1. n. A sled used to go down a bob track.
2. n. The sport of travelling down a bob track as fast as possible.
3. n. A short sled, mostly used as one of a pair connected by a reach or coupling; the compound sled so formed.
4. v. To ride a bobsled.

GNU Webster's 1913

1. n. United States A short sled, mostly used as one of a pair connected by a reach or coupling; also, the compound sled so formed.
2. n. a long racing sled (for 2 or more people), having two pairs of runners, with the front pair connected to a steering mechanism. They are usually raced one at a time down a steeply sloping path or specially constructed chute, with sharp banked curves, and attain high speeds.

WordNet 3.0

1. v. ride a bobsled
2. n. a long racing sled (for 2 or more people) with a steering mechanism
3. n. formerly two short sleds coupled together