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Question

1. have one foot in the grave

to be very old or very ill and likely to die soon

 

Ex: He had one foot in the grave when he volunteered to receive the world's first artificial heart.

 

2. At death's door

to be nearly dead

Ex: Our favorite aunt was at death's door

Answer 1

Answer #1: "Death is lingering at his doorstep!"

Answer #2: " Just about to be interred/buried!" or "Just about to die!"