How do you say big sister in Thai?

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

Formal:

* พี่สาว (Pii Sao): This is the most common and formal way to say "big sister." It literally translates to "elder sister."

Informal:

* พี่ (Pii): This is a more casual and informal way to refer to an older sister. It simply means "older sibling."

* นู๋ (Noo): This is used by younger siblings to address their older sisters. It means "little one" and is considered very affectionate.

Note:

* You should always use the formal "พี่สาว" when addressing someone else's older sister.

* You can use "พี่" or "นู๋" to address your own older sister, but it's important to be aware of the social context and the age difference between you and your sister.