插头 plug 是很多电子设备必不可少的部件。只有把它与插座连上时，设备才能通电；相反，如果把插头拔下来，设备会停止运行。我们常用表达 pull the plug on something “把插销拔下来”表示停止、阻止某事继续进行，尤指停止资助某个项目或计划，从而使该项目下马。
I'm afraid the university has pulled the plug on the plan to upgrade the computers in the library. We'll have to make do with what we've got for another couple of years.
When the viewing figures fell below a million the TV station pulled the plug on the series.
If you can't make a profit in five years we will have to pull the plug on further investments.
单词 plug 做动词时可以指在广播、电视等媒体上为某产品、活动、节目等大肆推销。做名词时它的含义是“宣传、广告”。
He's on four different TV programmes today plugging his new book.
I'm going to be giving a plug to a great new film.