be down for

基本解释

The login server may be down for maintenance.
登录服务器，可不停机维护。
It could be down for hours, or days or longer.
可能会断电几小时，几天，或更久。
blog.sina.com.cn
If you can be down for 10 or more years, exactly how much help is that?
如果你能坚持10年或更久，那又有什么用呢？
albert-zhaoxudong.blog.163.com

A few weeks later, before the talks could be completed, Upshur joined the president and congressional leaders for a trip down the Potomac River.
And in fact in one with the girl describing her side, she several times emphasizes this need for protection, need to be free from being torn down from people around them.
事实上像一个女孩子表达的那样，她好几次强调了需要保护的愿望，需要逃离那些打倒她的东西,逃离身边的人们。
麻省理工公开课 - 媒体、教育、市场课程节选
Deflection up and deflection down indicating that there was something strange that had yet to be accounted for.
发生了偏离,这就说明还有一些奇特的现象,需要我们去解释。
麻省理工公开课 - 固态化学导论课程节选

While we're missing key hardware specs at the moment, at least potential buyers can start pondering whether they'll be down for the design revisions or not.
ENGADGET