There are several different synonyms for the phrase "went up and down". Some of the most common options include oscillated, fluctuated, vacillated, undulated, wavered, seesawed, bobbed, bounced, jiggled, and jostled. Each of these words conveys a sense of movement or change, suggesting that something is shifting back and forth or experiencing ups and downs. Depending on the context in which the phrase is being used, one of these synonyms may be more appropriate than others. For example, oscillated might be a good choice for describing the movement of a pendulum, while wavered might be more fitting for describing a person's indecisiveness.