The crossword solution for the term 'immerses thoroughly' is 'STEEPS'. To steep something means to soak it in a liquid, usually hot, for an extended period of time. This process is often used to extract flavor from tea leaves or herbs, but can also be used to soften food items like rice or beans. Steeping is also used to infuse liquids with flavor, such as when making coffee or cocktails. Immersing something thoroughly in a liquid is a form of steeping, and is often done to ensure that all parts of the item are saturated.