pp of do.

/dʌn; dʌn/
adj [pred 作表语]
1 (of food) cooked enough （指食物）煮熟
*The joint isn't quite done yet. 这一大块肉煮得不太熟.
2 (infml 口) socially acceptable 社会上认可
*Smoking between courses simply isn't done. 吃饭时在两道菜之间吸烟是不得体的.
3 (idm 习语) be the done thing be conventional or acceptable behaviour 符合传统的或可以容许的行为
*For most people it is still the done thing to get married. 对于大多数人来说, 结婚仍然是天经地义的事. be/have done with sb/sth no longer work at sth or be involved with sb/sth 不再做某事物; 与某人[某事物]再无关系
*Let's spend another half an hour painting and then have done with it. 我们再画半个小时把它画完吧. over and done with completely finished 完结; 了结; 结束
*Their relationship is over and done with. 他们的关系完全断绝了. what is done cannot be undone (saying 谚) something that has already been done cannot be changed 已成定局, 无法改变; 木已成舟.

interj (used to show that one accepts an offer 用以表示接受一建议)
*`I'll give you
500 for the car.' `Done!' ｀这辆汽车, 我给你500英镑.＇｀说定了!＇