the closing remark or comment, as in an argument: By the rules of debate she would have the last word.
a final or definitive work, statement, etc.: This report is the last word on the treatment of arthritis.
the latest, most modern thing: Casual hairdos are the last word this season.
Origin of last word
First recorded in 1880–85
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019