(as) dead as a doornailinformal completely dead 死翘翘的(as) dead as a doornail• She looked dead as a doornail.• If looks could kill, Dooley Barlowe would have dropped him right there, dead as a doornail.• There we were, messing around with his things, and all the time he was dead as a doornail in Paris.
→ (as) dead as a doornail at doornail(1)