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kana written after a kanji to complete the full (usually kun) reading of the word; declensional kana ending
送りがなを間違えると意味が変わることがある。
Incorrect okurigana can change the meaning of a word.
漢字の送りがなの付け方を辞書で調べた。
I looked up how to attach okurigana to kanji in a dictionary.
送りがなの規則は小学校で習う基礎だ。
Okurigana rules are a foundation taught in elementary school.