The last word - Idioms by The Free Dictionary
the last word
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the last word or
the final word
COMMON If someone has the last word or the final word in a discussion or argument, they are the one who wins it or who makes the final decision. She does like to have the last word in any discussion. The final word will come from the Secretary of State.
the ˌlast ˈword (in something) the most recent, most fashionable, etc. of its type: They say that this new car is the last word in luxury. ♢ This is the last word in computer technology.
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?