"Dook" is a Scottish slang term that means "swim" or "dip." If you're looking for synonyms to use in place of this word, you might consider "bathe," "paddle," "plunge," "immerse," or "submerge." Each of these words carries a slightly different connotation, so you can choose the one that best fits your needs. For example, "bathe" may suggest a more leisurely or relaxing activity, while "plunge" implies a sudden and deep dive. Whatever word you choose, make sure it expresses the idea of getting in the water and enjoying a refreshing swim or dip.