The term 'LEGS' is a crossword solution for the phrase 'streaks on the side of a wineglass'. This refers to the thin streams of liquid that form when a glass of wine is swirled. These streaks, or LEGS, are caused by the alcohol and glycerol in the wine, which have different densities than the water in the wine. The LEGS can be used to indicate the quality of the wine, as higher-quality wines will have longer-lasting LEGS.