How do you say big sister in Chinese?

There are a few ways to say "big sister" in Chinese, depending on the context and the level of formality:

Formal:

* 姐姐 (jiě jie): This is the most common and general way to refer to an older sister. It's used for both close and distant relationships.

Informal:

* 姐 (jiě): This is a more casual and affectionate way to refer to an older sister, usually used by younger siblings or close friends.

* 大姐 (dà jiě): This literally means "big sister" and is used for the oldest sister in a family.

* 老大 (lǎo dà): This means "the eldest" and can be used to refer to an older brother or sister.

Note: You should use "姐姐" if you are not sure which term is appropriate.