There are many ways to express the act of doing the laundry, some of them more formal than others. Synonyms for "didst the laundry" include phrases such as "washed the clothes," "cleaned the garments," "rinsed the fabrics," "laundered the linens," and "did the wash." These expressions convey the same meaning in a different way, and can help us diversify our vocabulary and avoid repetition. Whether we use one or the other depends on the context, the level of formality, or personal preference. At the end of the day, what matters is that we keep our clothes clean and fresh.