"Worm along" is a colloquial phrase that means to move forward slowly or to progress gradually. There are several synonyms that can be used in place of this phrase, including "creep," "crawl," "grovel," "inch," and "slink." These words all describe a slow, steady movement, which is often used to indicate a lack of urgency or speed. Other synonyms that can be used in more formal settings might include "proceed," "advance," or "move forward," which convey a similar idea of gradual progress but with a more professional tone. Overall, there are many ways to describe slow, steady movement, and the choice of synonym will often depend on the context and desired tone.