The phrase "study at crawl" refers to the act of studying slowly or with difficulty. There are several synonyms for this phrase that can be used to express the same meaning. One such synonym is "study at a snail's pace," which refers to studying very slowly and taking a long time to comprehend information. Another synonym is "study with difficulty," which can imply struggling with the subject matter or difficulty concentrating. "Study laboriously" is another synonym, which suggests a lot of effort is being put into studying, often without much progress. Overall, there are many ways to express the idea of studying at a crawl, depending on the specific circumstances.