coaster
n//ˈkoʊstɚ//kustfarare, grytunderlägg, karottunderlägg, underlägg, ölunderlägg, kälke, släde
A merchant vessel that stays in coastal waters, especially one that travels between ports of the same country.
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.
Something that coasts or is used to coast.