The term 'Rings Around the Collar' is a phrase used to describe the appearance of a shirt collar that has been worn too often and has become discolored. The crossword solution for this term is LEIS, which is an abbreviation for leisuresuits, a type of clothing popular in the 1970s. Leisuresuits were known for their polyester fabric, which was prone to staining and discoloration. As such, the phrase 'Rings Around the Collar' became associated with leisuresuits and is still used today to describe the discoloration of a shirt collar.