The phrase "gets show road" is an idiomatic expression used to describe the act of setting off or starting a journey. There are a few synonyms that can be used in place of this phrase depending on the context and the level of formality required. Some of the common synonyms include "hits the road," "embarks on a journey," "sets out," "begins the trip," "starts traveling," or "commences the expedition." These alternatives convey the idea of beginning a journey, trip, or adventure in a more succinct and precise manner. It is always important to choose the appropriate synonym that fits the context of the sentence to avoid ambiguity or confusion.