Dead As A Doornail Edit Meaning

1.

Goes way past brain death, if your are dead as a doornail prepare to become a 'hotel for worms'.

Dodos perhaps are the only creatures with a similar lack of animation; see dead as the dodo.

On the morticians slab both Qusay and Udaywere laid out cold, both dead as a doornail, they looked so peacfull that it made me really happy to see them lying there.