***Be over and done with:be completely finished (常指令人不快或苦恼的事情)了结
Well I'm glad it's over and done with. I was so nervous. 我很高兴终于结束了,我刚才很紧张.
***A done deal:used to describe a situation, agrrangement, project, etc. that is completed and cannot be changed 木已成舟的事情,无法改变的事情(或安排等)
The managing director denied that the merger was a done deal, and said they were still in negotiations.
总经理否认合同已经敲定,声称此事仍在商讨中.