"At one jump" is a phrase that denotes achieving something in a single decisive move, sometimes even unexpectedly. Some synonyms for this phrase include "in one fell swoop," "at a stroke," and "in one go." These phrases are often used in a figurative or metaphorical sense. Other synonyms could include "in a flash," "in an instant," or "in the blink of an eye." All of these phrases imply that something was accomplished swiftly or easily, without requiring significant effort or time. They are useful for expressing sudden or surprising successes or accomplishments.