The term 'Rhine WHINE' is a combination of two words, 'Rhine' and 'WHINE'. Rhine is a major river in Europe that flows through Germany, Switzerland, Austria, and the Netherlands. It is the second longest river in Europe and is an important source of transportation and commerce. WHINE is an expression of complaint or dissatisfaction. Therefore, the term 'Rhine WHINE' is used to describe a situation where someone complains about something related to the Rhine River. The crossword solutions for this term are ACH, which stands for the German word 'Achse', meaning axis or axle. This refers to the Rhine River being an important axis of transportation and commerce in Europe.