Synonyms of 'at death's door'
▷ See death
dyingDictionary, going, sinkingHe was at death's door when the disease was finally diagnosed.
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at death's door
a variation in the strength of received radio signals due to variations in the conditions of the transmission medium
outside in the rapidly fading light
on the decline
Thesaurus for at death's door from the Collins English Thesaurus
If you say that someone is at death's door , you mean they are very ill indeed and likely to die.