Rub-a-dub is an onomatopoeic word that imitates the sound made by someone washing or scrubbing something. It is often used to describe the sound of water splashing or someone taking a bath. However, there are many other ways to describe this sound in English. Examples of synonyms for rub-a-dub include scrubbing, washing, cleaning, polishing, buffing, and scouring. Each of these words can be used to describe the sound of a person cleaning something, such as dishes, a bathtub, or a car. These words can also be used to describe other sounds, such as the sound of a brush against a painting canvas or the sound of a shoe scraping against a highly polished floor.