Soak through is a phrase that refers to the process of liquid penetrating a material and saturating it entirely. When trying to convey this same idea, one could use synonyms such as drench, saturate, permeate, and immerse. These words are all excellent replacements for "soak through" in both casual and formal conversations. Other synonyms include infiltrate, imbue, and submerge. These words emphasize the extent to which the material has been soaked. When choosing a synonym, context is essential because each word has its nuances. However, using any of these synonyms would make writing more vibrant and enable the reader to understand the description more clearly.