There are several synonyms for the phrase "one more." For example, "another" is a common synonym that is often used in place of "one more." Other synonyms include "an additional one," "yet another," "one further," and "one extra." These phrases are often used to indicate a desire or need for more of something, or to continue a particular action or situation. Additionally, in some cases, the use of synonyms can help to add variety and interest to your writing or speech, making it more engaging and impactful.