last word
last word {n.}
1. The last remark in an argument.
I never win an argument with her. She always has the last word.
2. The final say in deciding something.
The superintendent has the last word in ordering new desks.
3. {informal}
The most modern thing.
Mrs. Green's stove is the last word in stoves.
Categories:
Source: A Dictionary of American Idioms