A win-win situation is a desirable outcome where all parties benefit. However, there are several other synonymous phrases that can be used to describe such a scenario. One such phrase is "mutual benefit," which means both parties gain something from the outcome. Another synonymous term is "positive sum game," which refers to a situation where everyone gains something. "Beneficial outcome" is also used to describe a result where there is no loss for any party involved. "Synergy" is another term that refers to the positive interaction between two or more parties that results in a mutually beneficial situation. Lastly, "two-way street" is also a synonymous phrase for a win-win situation as it is a two-sided benefit.