When we talk about "the remaining one", we often refer to something that is left over or left behind. There are many ways to express this idea, such as using synonyms like the last one, the final one, the remaining item, the leftover item, the lone survivor, the solitary item, the solitary survivor, the only one left, the final survivor, and the last survivor. Each of these synonyms brings its own unique connotations and nuances that can help to convey the exact meaning you want to express. So next time you need to describe "the remaining one", consider using one of these synonyms to add depth and precision to your language.