The term 'champagne chiller' refers to a device used to keep champagne bottles cold. The crossword solution for this term is ICER, which is an acronym for Ice Chest Refrigerator. This type of refrigerator is designed to keep champagne bottles cold and can be used both indoors and outdoors. It is typically made of stainless steel and has a lid that can be opened and closed. The ICER is a great way to keep champagne chilled and ready to serve.