A common English idiom is, at death's door. It means that someone is quite sick and may be close to dying.
At death's door meaning: Close to dying.
At death's door origin: Death and an entryway (door) became associated with each other in England in the 1300s. At death, some people think that you go through a door of some kind to the next life.
At death's door examples:
"My friend is at death's door. I'm not sure she's going to make it."
"My grandpa was at death's door for months but he surprisingly recovered."
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Another popular American idiom: https://www.youtube.com/watch?v=NXgwNIMG1-s
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Want to find out more?
Check out: https://eslspeaking.org/american-english-idioms/
The Big Book of American Idioms: https://amzn.to/3o6YxZi
Even more Ideas for the TEFL Classroom: https://eslspeaking.org/
