A rug can be: a carpet with a finished edge, particularly one that can move (not a fitted carpet), often the foundation of a rooms decor. (see also: rug making) the command-line interface to the ZENworks Linux Management (ZLM) agent, which uses red carpet for Linux Management. a rug is a garment made by humans to protect their pets from the elements, as in a "horse rug" (see horse blanket) or a dog coat RuG, short for Rijksuniversiteit Groningen or The Univers