"Move across" can be replaced by a variety of synonyms depending on the context. When referring to physically crossing a space, synonyms such as "cross," "traverse," "pass over," and "travel across" can be used. In terms of emotions or information, synonyms such as "spread," "circulate," and "disseminate" can replace "move across." Additionally, for more specific contexts, there are synonyms like "sail across" for bodies of water and "glide across" for smooth surfaces. It's essential to choose the right synonym for the context, as it can significantly impact the meaning of the sentence.