Pull the Plug (Origin)

What Is the Origin of the Saying "Pull the Plug"?

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The term "pull the plug" means to bring something to an end. It stems from the idea of pulling the electrical-supply plug from the wall, thereby causing the machine to stop functioning.

Examples of Use:

I'm going to pull the plug on Netflix. It's too expensive.
If I slip into a coma, just pull the plug. That's no way to live.
They're threatening to pull the plug on this project so we need to start showing some results.

"Pull the plug" originated in the medical industry in the mid-20th century, where it referred specifically to pulling the plug from a life-support machine. Therefore, "pulling the plug" was used as a metonym (a related term) for turning off a life-support machine. As such, it is also a euphemism for ending someone's life.

We should not have a government program that determines if you're going to pull the plug on grandma. (US Senator Chuck Grassley)

The term "pull the plug" is typically used figuratively to announce the end of a project or another venture. It carries the connotation of the project or venture falling short of completion.

Your research is expensive and yielding no usable results. Expect the CEO to pull the plug at the end of the year.
The Czech tennis federation wasn't holding me back, but they could still pull the plug anytime they wanted. (Tennis star Martina Navratilova)

From a grammatical perspective, "pull the plug" is an example of alliteration, which contributes to its popularity.