"The last word" is a phrase that refers to having the final say or being the final decision-maker. Synonyms for this phrase include "final say," "deciding factor," "concluding remark," "ultimate authority," and "determining factor." It can also be expressed as "bottom line," "final verdict," or "ultimate judgment." Similarly, other phrases that have similar meanings include "end-all-be-all" or "be-all and end-all," "decisive moment," and "definitive conclusion." These phrases are often used in different contexts to emphasize the importance of being the final decision-maker or having the final say in a situation.