There are several synonyms for the phrase "in fine," which is commonly used to summarize or conclude an argument. Some of these synonyms include "in conclusion," "ultimately," "finally," "in summary," and "in short." These phrases all convey a similar message, indicating that the speaker is about to wrap up their thoughts and bring the discussion to a close. Another popular synonym for "in fine" is "to sum up," which also suggests that the speaker is giving a brief overview of their main points. Regardless of which phrase you choose to use, the goal is to make your conclusion clear and concise.