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(inflectional) ending of a word
end of a sentence
方言では語尾が独特だ。
In dialects, word endings are distinctive.
語尾を上げると疑問文になる。
Raising the word ending turns it into a question.
語尾の使い方次第で相手への印象が変わる。
Depending on how you use word endings, the impression you give changes.