(as) dead as a doornail
US /əz dɛd əz ə ˈdɔrˌneɪl/
UK /əz dɛd əz ə ˈdɔrˌneɪl/

1.
completamente muerto, muerto como un clavo
completely dead; no longer alive or functioning
:
•
The old car was as dead as a doornail after the accident.
El coche viejo estaba completamente muerto después del accidente.
•
I tried to revive the computer, but it was as dead as a doornail.
Intenté revivir la computadora, pero estaba completamente muerta.