The phrase "end of the line" is commonly used to describe a situation where all options have been exhausted or a final decision has been made. However, there are many other phrases that convey similar meanings. For instance, "the final straw" alludes to a situation where a person reaches their breaking point. "The last hurrah" implies that a person or group's final effort is being made. "The endgame" suggests that the final stages of a project or situation are being reached. "The finish line" connotes that a goal has been achieved. Overall, there are many synonyms for "end of the line" that can amplfully express the end of something.