The phrase "leaving no margin for error" implies a situation where there is no room for mistakes or slip-ups. There are several other synonyms that convey a similar sentiment, such as "zero tolerance for error," "no room for error," "precision required," "flawless execution needed," "exactness expected," and "maximum accuracy demanded." These phrases highlight the importance of getting every detail right and ensuring that mistakes are avoided at all costs. Whether it's in the context of sports, business, or any other arena, the need for precision and accuracy is paramount, and using these synonyms can help drive that point home.