Piddles, a verb meaning to urinate in small amounts, has a number of antonyms, including words like "contain," "restrain," "begrudge," "deny," and "refuse." These antonyms refer to the opposite concepts of limiting, withholding, and refusing, rather than releasing or expelling fluids. Phrases that could be opposite to "piddles" include "holds it in," "avoids it," or "controls the urge." It's important to note, however, that these antonyms only apply in the context of bodily functions- in other contexts, the opposite of "piddles" will likely be different.