"Watches step" is a phrase often used in military or marching contexts to indicate that individuals should pay attention to their steps and keep in time with those around them. Some synonyms for this phrase include "marches in rhythm," "follows cadence," "matches pace," and "moves in time." These phrases emphasize the importance of coordinating movement and maintaining a uniform appearance and purpose, which is often necessary in military settings. Other similar phrases that convey a similar message might include "marches in step," "maintains formation," or "marches in time." Ultimately, whichever phrase is used, the focus remains on maintaining order, discipline, and unity among those in the group.