last word, the

last word, the idiom
  1. The final statement in a verbal argument, as in Karen is never satisfied unless she has the last word. [Late 1800s]
  2. A conclusive or authoritative statement or treatment; also, the power or authority of ultimate decision. For example, This report is considered to be the last word on genetic counseling, or In financial matters, the treasurer has the last word. [Late 1800s]
  3. The latest thing; the newest, most fashionable of its kind. For example, Our food processor is the last word in kitchen gadgetry. [c. 1930]

The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

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