There are several synonyms for the informal phrase "took a leak" which means to urinate. Some of the most popular synonyms include "went to the bathroom", "went for a wee", "took a pee", "relieved oneself", "went to relieve oneself", "went for a tinkle" and "went to use the washroom". These synonyms are often used in different social settings where casual language may not be appropriate. In formal or professional environments, it is important to use appropriate language for bodily functions. Whatever expression you choose to use, it is always important to be respectful and mindful of those around you.