noun
Familiar, affectionate term for one's own older sister. Also used to address a young woman informally, similar to 'miss' or 'big sis'.
See also: 姉さん
うちの姉ちゃんは大学生です。
My older sister is a university student.
ねえちゃん、この服いくら？
Hey miss, how much is this outfit?
noun
Informal way to refer to or address a young woman, often by a male speaker. Can sound rough or overly familiar depending on context.
あの姉ちゃん、かわいいな。
That girl is cute.