- informal a person's sister (often used as a form of address)〈非正式〉姐姐; 妹妹（常用于直接称呼）：
where are you going, sis?
你去哪儿, 姐姐（或妹妹）？
词源
mid 17th cent.: abbreviation.
- S. African informal used to express disappointment, disgust, or contempt〈南非, 非正式〉［用于表示失望、厌恶或鄙视］哎; 呸。
词源
from Afrikaans sies.