Dead as a door nail

Meaning

Completely dead or inactive.

Usage

Describes people, machines, or ideas that can no longer function.

Origin & History

Origins and dates here are approximate summaries. Many idioms have disputed or unknown origins, and not every date has been checked against a historical dictionary, so treat specific dates and stories as a starting point rather than a citation.

Door nails were hammered flat so they could not be reused, emphasizing irreversibility.

Used by Shakespeare and recorded as far back as the 1500s.