The term under shorts may seem straightforward, but there are actually many different synonyms you can use to describe this type of clothing. Some people may use the term undershorts, which is similar. Other options include boxer briefs, boxer shorts, trunks, briefs, and even compression shorts. Each of these options has a slightly different style and fit, so it's important to choose one that works best for your needs. Whether you're looking for something lightweight and breathable for hot weather or something that provides more support and compression during exercise, there are plenty of synonyms for under shorts that you can choose from.