has-been

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Today he is a has-been.
如今他已成为明日黄花。
At Apple, Jobs turned a struggling has-been into a world-beating innovation factory.
毕竟，乔布斯把一个奄奄一息的苹果变成了世界级的创新工厂。
The Pistons were the only team willing to sign this far-beyond washed-up has-been, and this is how they're repaid.
活塞是唯一可怜这位前超级巨星的球队，可这就是他们得到的回报。多么忘恩负义的球员啊。

Tell all the Truth but tell it slant -- The truth about Emily Dickinson has been difficult to discover.
He tells us that everything that we've read up to this point that has been spoken by a third-person narrator.
他把目前为止我们读到的,所有以第三人称叙述的事情都告诉我们。
耶鲁公开课 - 弥尔顿课程节选
From next term we try to move it into the own term version of electromagnetism, which are up till now has been taught in the lecture-station format.
从下学期起我们将搬去,电磁学自己的实验室，现在这门课还是用,讲座-背诵型方式讲授。
麻省理工公开课 - 媒体、教育、市场课程节选

Some critics deride the senate as a retirement home for has-been politicians and party hacks.
ECONOMIST: The House of Lords

a person who in the past was famous, important, admired, or good at something, but is no longer any of these

If you describe someone as a has-been, you are indicating in an unkind way that they were important or respected in the past, but they are not now.