last word

noun
1.
the closing remark or comment, as in an argument: By the rules of debate she would have the last word.
2.
a final or definitive work, statement, etc.: This report is the last word on the treatment of arthritis.
3.
the latest, most modern thing: Casual hairdos are the last word this season.

Origin:
1880–85

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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WordNet
last word

noun
1. the final statement in a verbal argument; "she always gets the last word" 
2. an authoritative statement; "my doctor has the last word on the medicines I take" 
3. elegance by virtue of being fashionable [syn: chic
WordNet® 3.0, © 2006 by Princeton University.
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Example sentences
Even then she has to have the last word with a quiet but definite sound.
To put the last word on the page brings the process to an end.
Neither is this particular research the last word on the topic.
Be the last word on the product, and your magazine becomes a place advertisers
  can't afford not to be.
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