大おお姉ねえさんMeanings1nouneldest older sister (honorific)honorific or respectful (sonkeigo)Honorific term used to refer to one's own eldest older sister, showing respect. Not used for other people's sisters.大姉おおねえさんは来らい年ねん結けっ婚こんするそうです。I hear my eldest older sister is getting married next year.
