Notice: a formal letter or statement saying that you will or must leave your job or house at the end of a particular period of time 辞职信;搬迁通知
He has handed in his notice.
他递交了辞呈.
They gave her two weeks'notice.
他们通知她两周后搬走.
Downsize: to reduce the number of people who work in a company, business, etc. in order to reduce costs (公司、企业等)裁员,精减