the last word
1. The final words in an argument or discussion, especially one that decisively or conclusively ends it. Everyone started shouting, trying to get in the last word, and the whole meeting just descended into chaos.
2. The most recent, modern, or advanced version of something. Typically followed by "in (something)." It may not look like much, but I can assure you that this machine is the last word in neural imaging.
*last word
and *final word; *final sayFig. the final point (in an argument); the final decision (in some matter). (*Typically: get ~; have ~; give some one ~.) The boss gets the last word in hiring. Why do you always have to have the final word in an argument?
your/the last/final ˈword (on/about something)
your, etc. final decision or statement about something: ‘Will you take £900?’ ‘No, £1 000 and that’s my last word.’Is that your final word on the matter?