coaster

1. A person who uses a sled or toboggan to slide down a slope covered with ice or snow; a sledder, a tobogganist. (US)
2. One who succeeds while making only a minimal effort.
3. A small stand or tray, sometimes with wheels, used to pass something such as a decanter or wine bottle around a tabletop. (dated)
4. A small, flat or tray-like object on which a bottle, cup, glass, mug, etc., is placed to protect a table surface from drink spills, heat, or water condensation.
5. A useless compact disc or DVD, such as one that was burned incorrectly or has become corrupted. (slang)
6. A sled or toboggan. (US)
7. A minibus; small bus (especially Toyota Coaster or in general resembling such regardless of brand name) · coaster bus

الجمع coasters