"Held your water" is a common phrase that refers to someone's ability to control their bladder. This phrase is somewhat informal and may be considered inappropriate in more formal settings. However, there are many synonyms that can be used in more formal or professional settings. Some of these synonyms include "exercised self-control," "maintained composure," "controlled bodily functions," and "maintained a professional demeanor." These phrases can be used in a variety of contexts, such as job interviews, important meetings, or public speeches. Ultimately, it is important to use language that is appropriate to the situation at hand, while avoiding phrases that may be considered too informal or vulgar.