Meaning of “last word” in the English Dictionary

british dictionary

"last word" in British English

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last wordnoun [ S ]

uk /ˌlɑːst ˈwɜːd/ us /ˌlæst ˈwɝːd/

the final remark in an argument or discussion:

You're not going, Helena, and that's my last word on the matter.
She always has to have the last word (= win the argument).

(Definition of “last word” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)