Jump across is a commonly used phrase that means to leap over something or make a quick, sudden movement from one side of an obstacle to another. Some synonyms for the phrase include hop over, vault over, bound over, clear, skip over, hurdle, and leapfrog. These words all describe the action of moving quickly and efficiently over an obstacle, such as a fence, ditch, or stream. Depending on the context and the specific scenario, different synonyms may be more appropriate to use. However, they all convey a similar image of agile movement and overcoming an obstacle with ease.