A sound defeat is a phrase that can be used to describe a situation in which one party has been completely and utterly defeated. It is often used in sports, where a team or individual has been soundly beaten by their opponent. The term can also be used in other contexts, such as politics or business. In this context, the crossword solutions for the term A SOUND DEFEAT are THRASHING (9 letters), ROUT (4 letters), and ROAR (4 letters). THRASHING is an intense form of beating, while ROUT is a complete and utter defeat. ROAR is a loud sound, often associated with victory or triumph, but in this case it is used to emphasize the soundness of the defeat.