The last word is the final remark in an argument, and the winning of it. He must always have the last word.
Wanting it is treated as a fault rather than a strength, since it is about the argument rather than the point. It also means the final authority, so a person can be the last word on a subject.
1phrasethe last wordThe final remark in an argument, and the winning of it.
“She let him have the last word and won everything else.”
the last word is a phrase.
Practised in Idioms