There are numerous synonyms for the phrase "crawling all fours," which refers to an animal or person moving on their hands and knees. Some common alternatives include "scrambling," "clambering," "creeping," "slinking," and "slithering." These words evoke different mental images and have different connotations, depending on the context in which they're used. For example, "scrambling" might suggest a quick and frenzied movement, while "slithering" could imply a smoother, more fluid motion. Choosing the right synonym can add depth and specificity to your writing, helping to create a more vivid picture in the reader's mind.