There are many different synonyms for the phrase "dries up." Some of the most common include "evaporates," "disappears," "vanishes," and "runs out." Other potential options might include "depletes," "exhausts," "fades," or "wanes." Depending on the specific context in which the phrase is being used, some synonyms may be more appropriate or effective than others. Ultimately, the goal is to find the word or phrase that best captures the meaning of "dries up" in a given situation, whether that involves describing a physical substance like water or an abstract concept like enthusiasm or energy.