Meaning of the word "at death's door" in English

What does "at death's door" mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

at death's door

US /æt dɛθs dɔr/
UK /æt dɛθs dɔː/
"at death's door" picture

Idiom

very ill and likely to die

Example:
After the accident, he was at death's door for several days.
The old dog has been at death's door for a week, but he's still holding on.